0000950170-24-020157 | 10-K | XBRL Viewer

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Income Taxes - Schedule of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current provision:
Federal	$ 52,352	$ 43,207	$ 22,133
State	14,614	11,140	10,438
Foreign	532	175	253
Current (benefit) provision	67,498	54,522	32,824
Deferred (benefit) provision:
Federal	(37,583)	(20,278)	5,698
State	(272)	(1,789)	669
Foreign	(9)	(47)	(204)
Deferred (benefit) provision	(37,864)	(22,114)	6,163
Income tax provision (benefit)	$ 29,634	$ 32,408	$ 38,987

Goodwill and Other Intangible Assets - Summary of Changes in Carrying Value of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Goodwill [Line Items]
Balance as of December 31, 2022	$ 157,467
Foreign currency translation adjustment	431
Balance at December 31, 2023	157,898
U.S. Marketplace \| United States
Goodwill [Line Items]
Balance as of December 31, 2022	12,477
Balance at December 31, 2023	12,477
Digital Wholesale \| International
Goodwill [Line Items]
Balance as of December 31, 2022	130,451
Balance at December 31, 2023	130,451
Other \| International
Goodwill [Line Items]
Balance as of December 31, 2022	14,539
Foreign currency translation adjustment	431
Balance at December 31, 2023	$ 14,970

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Insider Trading Arrangements

3 Months Ended

Dec. 31, 2023

Trading Arrangements, by Individual

Material Terms of Trading Arrangement

Rule 10b5-1 Plan Trading Arrangements

During the three months ended December 31, 2023, each of the following officers adopted a “Rule 10b5-1 trading arrangement” (as defined in Item 408 of Regulation S-K) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and our policies on insider trading:


Name & Title	Date Adopted	Aggregate Number/Dollar Value of Shares of Class A Common Stock to be Purchased or Sold Pursuant to Trading Arrangement	Expiration Date(1)
Andrea Eldridge, Chief People Officer	November 15, 2023	37,716 shares to be sold	November 29, 2024

Matthew Quinn, Chief Technology Officer	December 5, 2023	$45,000 in shares to be sold	December 31, 2024

Dafna Sarnoff, Chief Marketing Officer	December 15, 2023	73,817 shares to be sold(2)	March 31, 2025

Samuel Zales, President and Chief Operating Officer	November 22, 2023	421,220 shares to be sold(2)(3)	January 31, 2025

Javier Zamora, General Counsel and Corporate Secretary	November 10, 2023	25,778 shares to be sold(2)	March 1, 2024

______________________

(1) The Rule 10b5-1 trading arrangement permits transactions through and including the earlier to occur of (a) the completion of all sales or (b) the date listed in the table. The arrangement also provides for automatic expiration in the event of liquidation, dissolution, bankruptcy, insolvency, or death of the adopting person.

(2) The Rule 10b5-1 trading arrangement includes the sale of shares to be received upon future vesting of certain outstanding equity awards, net of any shares withheld by us to satisfy applicable taxes. The number of shares to be withheld, and thus the exact number of shares to be sold pursuant to such officer’s Rule 10b5-1 trading arrangement, can only be determined upon the occurrence of the future vesting events. For purposes of this disclosure, we have reported the gross number of shares to be received upon the future vesting of such equity awards, before subtracting any shares to be withheld by us to satisfy applicable taxes in connection with such future vesting events.

(3) The Rule 10b5-1 trading arrangement is intended to permit Mr. Zales to exercise and sell expiring stock options, subject to certain price limits.

Other than those disclosed above, none of our directors or officers adopted, modified, or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” in each case as defined in Item 408 of Regulation S-K.

Andrea Eldrige

Trading Arrangements, by Individual

Name

Andrea Eldridge

Title

Chief People Officer

Rule 10b5-1 Arrangement Adopted

true

Adoption Date

November 15, 2023

Arrangement Duration

381 days

Aggregate Available

37,716

Trd Arr Expiration Date

November 29, 2024

Matthew Quinn

Trading Arrangements, by Individual

Name

Matthew Quinn

Title

Chief Technology Officer

Rule 10b5-1 Arrangement Adopted

true

Adoption Date

December 5, 2023

Arrangement Duration

393 days

Aggregate Available

45,000

Trd Arr Expiration Date

December 31, 2024

Dafna Sarnoff

Trading Arrangements, by Individual

Name

Dafna Sarnoff

Title

Chief Marketing Officer

Rule 10b5-1 Arrangement Adopted

true

Adoption Date

December 15, 2023

Arrangement Duration

473 days

Aggregate Available

73,817

Trd Arr Expiration Date

March 31, 2025

Samuel Zales

Trading Arrangements, by Individual

Name

Samuel Zales

Title

President and Chief Operating Officer

Rule 10b5-1 Arrangement Adopted

true

Adoption Date

November 22, 2023

Arrangement Duration

437 days

Aggregate Available

421,220

Trd Arr Expiration Date

January 31, 2025

Javier Zamora

Trading Arrangements, by Individual

Name

Javier Zamora

Title

General Counsel and Corporate Secretary

Rule 10b5-1 Arrangement Adopted

true

Adoption Date

November 10, 2023

Arrangement Duration

113 days

Aggregate Available

25,778

Trd Arr Expiration Date

March 1, 2024

Other Directors and Officers

Trading Arrangements, by Individual

Rule 10b5-1 Arrangement Adopted

false

Non-Rule 10b5-1 Arrangement Adopted

false

Rule 10b5-1 Arrangement Terminated

false

Non-Rule 10b5-1 Arrangement Terminated

false

Rule 10b 51 Arr Modified Flag

false

Non Rule 10b 51 Arr Modified Flag

false

Fair Value of Financial Instruments - Schedule of Fair Value Levels, Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment, Type [Extensible Enumeration]	Mutual Fund [Member]	Mutual Fund [Member]
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	$ 73,449	$ 175,486
Short-term investments	20,724
Total	94,173	175,486
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	73,449	175,486
Short-term investments	20,724
Total	$ 94,173	$ 175,486

- Definition

Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company.

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+ Details

Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 142,343	$ 89,096
Less accumulated depreciation and amortization	(58,973)	(48,968)
Property and equipment, net	83,370	40,128
Capitalized Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,326	7,877
Capitalized Internal-Use Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	12,279	7,429
Capitalized Website Development
Property Plant And Equipment [Line Items]
Property and equipment, gross	57,158	36,369
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,149	8,615
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	23,308	24,225
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	39,835	4,161
Finance Lease Right-of-use Assets
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 288	$ 420

Earnings Per Share - Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Consolidated net income	$ 22,053	$ 78,954	$ 110,373
Net (loss) income attributable to redeemable noncontrolling interest	(14,889)	(5,433)	1,129
Deemed dividend on redemption of noncontrolling interest	5,838
Accretion of redeemable noncontrolling interest to redemption value		(109,398)	109,398
Net income (loss) attributable to common stockholders - basic	31,104	193,785	(154)
Net (loss) income attributable to redeemable noncontrolling interest	(14,889)	(5,433)
Net income (loss) attributable to common stockholders - diluted	$ 22,053	$ 78,954	$ (154)
Weighted average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders - basic	113,240,139	118,474,991	117,142,062
Dilutive effect of share equivalents resulting from stock options	225,691	275,330
Dilutive effect of share equivalents resulting from unvested restricted stock units	723,004	366,258
Dilutive effect of share equivalents resulting from CarOffer incentive units and noncontrolling interest		9,034,395
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders - diluted	114,188,834	128,150,974	117,142,062
Net income (loss) per share attributable to common stockholders:
Basic	$ 0.27	$ 1.64	$ 0
Diluted	$ 0.19	$ 0.62	$ 0

Income Taxes

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

13. Income Taxes

For the years ended December 31, 2023, 2022, and 2021, the domestic and foreign components of income before income taxes are as follows:


	Year Ended December 31,
	2023		2022		2021
United States	$	50,632	$	110,213	$	148,037
Foreign		1,055		1,149		1,323
Income before income taxes	$	51,687	$	111,362	$	149,360

For the years ended December 31, 2023, 2022, and 2021, the components of the provision for (benefit from) income taxes are as follows:


	Year Ended December 31,
	2023			2022			2021
Current provision:
Federal	$	52,352		$	43,207		$	22,133
State		14,614			11,140			10,438
Foreign		532			175			253
		67,498			54,522			32,824
Deferred (benefit) provision:
Federal		(37,583	)		(20,278	)		5,698
State		(272	)		(1,789	)		669
Foreign		(9	)		(47	)		(204	)
		(37,864	)		(22,114	)		6,163
Income tax provision	$	29,634		$	32,408		$	38,987

For the year ended December 31, 2023, 2022, and 2021, the components of the effective tax rate are as follows:


	Year Ended December 31,
	2023			2022			2021
U.S. federal taxes at statutory rate		21.0	%		21.0	%		21.0	%
State taxes, net of federal benefit		22.1			7.7			7.5
Nondeductible expenses		1.4			0.5			0.3
Stock compensation		7.3			2.8			0.3
Foreign rate differential		(0.1	)		(0.1	)		(0.2	)
Federal and state credits		(9.5	)		(4.7	)		(2.6	)
Disallowed officer compensation		0.4			0.8			1.0
Investment in partnership		4.7			1.0			(0.3	)
Federal, state, and foreign provision to return differences		(1.4	)		(0.8	)		(0.7	)
Uncertain tax provision		0.4			0.5			—
CarOffer and AutoList M&A		2.9			—			—
Other		0.0		(0.0)				(0.2	)
Consolidated effective tax rate		49.2	%		28.7	%		26.1	%
Effective tax rate attributable to redeemable noncontrolling interest		(4.7	)		(1.0	)		0.2
Effective tax rate attributable to CarGurus, Inc.		44.5	%		27.7	%		26.3	%

For the year ended December 31, 2023, the effective tax rate attributable to CarGurus, Inc. was 44.5%, which is greater than the statutory tax rate of 21%, principally due to state and local income taxes inclusive of the impact from the recently passed Massachusetts apportionment tax rule, shortfalls on the taxable compensation of share-based awards, the Section 162(m) excess officer compensation limitation, and tax impact associated with the 2023 CarOffer Transaction, partially offset by federal and state research and development tax credits.

For the year ended December 31, 2022, the effective tax rate attributable to CarGurus, Inc. was 27.7%, which is greater than the U.S. federal statutory rate primarily due to state and local income taxes, the exclusion of loss from investment in partnership, shortfalls on the taxable compensation of share-based awards, and the Section 162(m) excess officer compensation limitation, partially offset by federal and state research and development tax credits.

For the year ended December 31, 2021, the effective tax rate attributable to CarGurus, Inc. was 26.3%, which is greater than the U.S. federal statutory rate primarily due to state and local income taxes, shortfalls on the taxable compensation of share-based awards, and the Section 162(m) excess officer compensation limitation, which became applicable in May 2021 upon the expiration of the transition period permitted following the IPO, partially offset by federal and state research and development tax credits.

As of December 31, 2023 and 2022, the approximate income tax effect of each type of temporary difference and carryforward is as follows:


	As of December 31,
	2023			2022
Deferred tax assets:
Net operating loss carryforwards	$	304		$	461
Credit carryforwards		928			928
Stock-based compensation		5,353			5,441
Lease liability		47,907			13,557
Investment in partnership		—			8,325
Accruals and reserves		4,642			3,770
Intangible assets		20,294			—
Capitalized research and development		45,468			25,342
		124,896			57,824
Valuation Allowance		(305	)		(258	)
		124,591			57,566
Deferred tax liabilities:
Prepaid expenses		(2,459	)		(2,466	)
Deferred commissions		(5,531	)		(4,200	)
Right of use assets		(42,531	)		(11,237	)
Intangible assets		—			(733	)
Capital lease		(72	)		—
Property and equipment		(700	)		(3,496	)
		(51,293	)		(22,132	)
Net deferred tax assets	$	73,298		$	35,434

As of December 31, 2023 and 2022, valuation allowances were immaterial. Based upon the level of historical U.S. earnings and future projections over the period in which the net deferred tax assets are deductible, the Company believes it is more likely than not that it will realize the benefits of these deductible differences, with the exception of the deferred tax asset related to intangible assets in Ireland. For the years ended December 31, 2023 and 2022, the change in the valuation allowance was $47 and $29, respectively.

As of December 31, 2023, the Company had federal and state net operating loss (“NOL”) carryforwards of $277 and $3,442, respectively. The federal NOL carryforward, subject to an annual limitation of 80% of taxable income, does not expire. The state NOL carryforwards expire at various dates through 2040. As of December 31, 2023, the Company had federal and state tax credit carryforwards of $673 and $322, respectively, available to reduce future tax liabilities. The federal tax credit carryforward expires in 2040. The state tax credit carryforwards indefinitely as it is related to California. Utilization of the NOL and tax credit carryforwards, respectively, may be subject to an annual limitation due to ownership change limitations that have occurred previously or that could occur in the future, as provided by Section 382 of the Internal Revenue Code (“Section 382”), as well as similar state provisions. Ownership changes may limit the amount of NOL or tax credit carryforwards that can be utilized annually to offset future taxable income and tax, respectively. In general, an ownership change, as defined by Section 382, results from transactions that increase the ownership of 5% stockholders in the stock of a corporation by more than 50% in the aggregate over a three-year period.

As of December 31, 2023 and 2022, changes in the gross uncertain tax position (excluding interest and penalties) are as follows:


	As of December 31,
	2023		2022
Unrecognized tax benefits at beginning of year	$	598	$	—
Increase related to current year tax provision		178		198
Increase related to prior year tax provision		36		400
Unrecognized tax benefits at end of year	$	812	$	598

For the year ended December 31, 2023, income tax expense and liability related to uncertain tax positions, exclusive of immaterial interest or penalties related to uncertain tax provisions, was $812, which would favorably affect the Company's effective tax rate, if recognized. For the year ended December 31, 2022, income tax expense and liability related to uncertain tax positions, exclusive of immaterial interest or penalties related to uncertain tax provisions, was $598, which would favorably affect the Company's effective tax rate, if recognized.

The Company permanently reinvests the earnings, if any, of its foreign subsidiaries and, therefore, does not provide for U.S. income taxes that could result from the distribution of those earnings to the Company. As of December 31, 2023 and December 31, 2022, the amount of unrecognized deferred U.S. taxes on these earnings was immaterial.

The Company and its subsidiaries are subject to various U.S. federal, state, and foreign income tax examinations. The Company is currently not subject to income tax examination for the tax years of 2019 and prior as a result of applicable statute of limitations of the Internal Revenue Service and a majority of applicable state jurisdictions. The Company is currently not subject to examination in its foreign jurisdictions for tax years 2017 and prior.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

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-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-21

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482526/740-270-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

+ Details

Commitments and Contingencies - Summary of Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Operating Lease Commitments
2024	$ 3,150
2025	18,881
2026	22,332
2027	22,740
2028	23,160
Thereafter	208,079
Total lease payments	298,342
Less imputed interest	(103,952)
Total	$ 194,390

Earnings Per Share - Additional Information (Details)	12 Months Ended
Earnings Per Share - Additional Information (Details)	Dec. 31, 2023 Vote shares	Dec. 31, 2022 shares	Dec. 31, 2021 shares
Earnings Per Share Basic [Line Items]
Conversion of stock, description	Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time or automatically upon certain events described in the Company’s amended and restated certificate of incorporation, including upon either the death or voluntary termination of the Company’s Executive Chair.
Undistributed earnings ratio used to calculate allocation to class of stock	100.00%
Market Based Performance Award RSU
Earnings Per Share Basic [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted weighted-average shares outstanding	0	0	14,682
Class A Common Stock
Earnings Per Share Basic [Line Items]
Right to voting	one vote per share
Number of votes entitled to stockholders per share \| Vote	1
Conversion of stock	0	0	3,077,327
Class B Common Stock
Earnings Per Share Basic [Line Items]
Right to voting	ten votes per share
Number of votes entitled to stockholders per share \| Vote	10
Class of share converted to another class		one share of Class A common stock
Conversion of stock	1

Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 117,275	$ 117,211
Accumulated Amortization	93,572	63,510
Accumulated Impairment	647	647
Net Carrying Amount	$ 23,056	$ 53,054
Brand
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	7 years 4 months 24 days	8 years 4 months 24 days
Gross Carrying Amount	$ 32,193	$ 32,129
Accumulated Amortization	10,262	7,227
Net Carrying Amount	$ 21,931	$ 24,902
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	0 years	1 year
Gross Carrying Amount	$ 19,870	$ 19,870
Accumulated Amortization	19,620	13,609
Net Carrying Amount	$ 250	$ 6,261
Developed Technology
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	0 years	1 year
Gross Carrying Amount	$ 65,212	$ 65,212
Accumulated Amortization	63,690	42,674
Accumulated Impairment	647	647
Net Carrying Amount	$ 875	$ 21,891

Consolidated Balance Sheets - USD ($)
$ in Thousands

Dec. 31, 2023

Dec. 31, 2022

Current assets:

Cash and cash equivalents

$ 291,363

$ 469,517

Short-term investments

20,724

Accounts receivable, net of allowance for doubtful accounts of $610 and $1,809, respectively

39,963

46,817

Inventory

331

5,282

Prepaid expenses, prepaid income taxes and other current assets

25,152

21,972

Deferred contract costs

11,095

8,541

Restricted cash

2,563

5,237

Total current assets

391,191

557,366

Property and equipment, net

83,370

40,128

Intangible assets, net

23,056

53,054

Goodwill

157,898

157,467

Operating lease right-of-use assets

169,682

56,869

Restricted cash

9,378

Deferred tax assets

73,356

35,488

Deferred contract costs, net of current portion

12,998

8,853

Other non-current assets

7,376

8,499

Total assets

918,927

927,102

^[1]

Current liabilities:

Accounts payable

47,854

32,529

Accrued expenses, accrued income taxes and other current liabilities

33,718

39,193

Deferred revenue

21,322

12,249

Operating lease liabilities

12,284

14,762

Total current liabilities

115,178

98,733

Operating lease liabilities

182,106

51,656

Deferred tax liabilities

Other non–current liabilities

4,733

5,301

Total liabilities

302,075

155,744

Commitments and contingencies (Note 10)

Redeemable noncontrolling interest

36,749

Stockholders’ equity:

Preferred stock, $0.001 par value per share; 10,000,000 shares authorized; no shares issued and outstanding

Additional paid–in capital

263,498

413,092

Retained earnings

354,147

323,043

Accumulated other comprehensive loss

(901)

(1,644)

Total stockholders’ equity

616,852

734,609

Total liabilities, redeemable noncontrolling interest and stockholders' equity

918,927

927,102

Class A Common Stock

Stockholders’ equity:

Common stock

102

Class B Common Stock

Stockholders’ equity:

Common stock

$ 16

[1]

As of December 31, 2022, Digital Wholesale assets did not reflect certain Dealer-to-Dealer and IMCO related capitalized website development assets from the U.S. Marketplace segment. During the three months ended March 31, 2023, the Company updated Digital Wholesale assets to reflect certain Dealer-to-Dealer and IMCO related capitalized website development amortization assets from the U.S. Marketplace segment and accordingly updated Digital Wholesale assets as of December 31, 2022 and 2021 for comparative purposes.

Stock-based Compensation - Additional Information (Details) - USD ($)

12 Months Ended

Jan. 02, 2024

Nov. 07, 2023

Jan. 03, 2023

Jan. 03, 2022

Aug. 22, 2016

Aug. 15, 2015

Jun. 26, 2015

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Nov. 30, 2023

Dec. 08, 2022

Dec. 31, 2020

Oct. 16, 2017

Jun. 21, 2017

Dec. 31, 2006

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Stock-based compensation expense

$ 113,456,000

$ 33,682,000

$ 77,710,000

Capitalized website development and internal-use software costs excluded from stock-based compensation expense

5,472,000

4,468,000

3,247,000

Income tax benefit from stock-based compensation expense

5,353,000

5,441,000

5,301,000

Employee tax withholding requirements for net share settlements of equity awards

15,729,000

16,025,000

15,388,000

Payment of withholding taxes on net share settlements of restricted stock units

$ 15,597,000

16,022,000

15,388,000

Number of shares repurchased and retired

11,076,755

Share repurchased and retired, value

$ 204,127,000

Share repurchased and retired at average cost price per share

$ 18.43

Redeemable noncontrolling interest

$ 0

$ 36,749,000

$ 162,808,000

$ 0

Deemed dividend on redemption of noncontrolling interest

$ 5,838,000

Share repurchase program effective date

Jan. 01, 2024

Share repurchase program expiration date

Dec. 31, 2024

Employee Stock Option

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of options granted in period

30,266

619,618

Aggregate intrinsic value for options exercised

$ 229,000

^[1]

$ 3,774,000

$ 6,027,000

Unrecognized stock-based compensation expense related to unvested stock options

$ 2,623,000

Unrecognized stock-based compensation expense, expected period for recognition

1 year 3 months 18 days

Stock-based compensation expense

$ 2,386,000

$ 2,553,000

$ 2,471,000

RSUs

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of units granted in period

4,133,865

Unvested units

5,687,711

4,484,291

Weighted average grant date fair value of RSUs granted

$ 17.47

$ 28.94

$ 33.83

Number of RSUs vested and settled during period

1,649,294

1,575,206

Total fair value of RSUs vested

$ 55,136,000

$ 52,423,000

Unrecognized stock-based compensation expense related to RSUs

$ 108,714,000

Unrecognized stock-based compensation expense, expected period for recognition

2 years 6 months

Stock-based compensation expense

$ 55,527,000

52,224,000

52,916,000

Number of units vested in period

2,440,510

Number of units forfeited in period

489,935

CO Incentive Units and Subject Units

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Stock-based compensation expense

$ 26,552,000

$ (21,095,000)

$ 22,323,000

(Increase) decrease in stock-based compensation expense

(47,647,000)

Noncontrolling Interest Units

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Stock-based compensation expense

28,991,000

(Increase) decrease in stock-based compensation expense

$ 28,991,000

Class A Common Stock

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Employee tax withholding requirements and option costs due to net share settlement

840,995

566,267

527,237

Class A Common Stock | Maximum

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Aggregate share repurchase price

$ 250,000,000

2020 CO Plan | Incentive Units

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

485,714

Number of units granted in period

Number of shares available for issuance during period

Accelerated and redeemed units

142,857

Unvested units

342,857

Unrecognized stock based compensation expense related to unvested units

$ 0

Stock-based compensation expense

$ 1,229,000

Number of units vested in period

Number of units forfeited in period

2020 CO Plan | Subject Units

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Unrecognized stock based compensation expense related to unvested units

$ 0

Vesting Agreement | Subject Units

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Stock options, granted

Number of shares available for issuance during period

Units issued and unvested

288,395

Number of units vested in period

144,197

Number of units forfeited in period

2021 CO Plan

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

228,571

2021 CO Plan | Incentive Units

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

228,571

Number of shares available for issuance during period

2021 CO Plan | Subject Units

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares available for issuance during period

2006 Plan

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Stock options, granted

Number of units granted in period

2006 Plan | Class B Common Stock

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

3,444,668

2015 Plan

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

603,436

Term of authorized shares

10 years

Award expiration date

Aug. 21, 2026

Equity Incentive Plan, plan modification, description and terms

(1) the number of shares of Class A common stock was increased, on a share for share basis, by the number of shares of Class B common stock that were (a) subject to outstanding options granted under the 2006 Plan that expired, terminated, or were canceled for any reason without having been exercised, (b) surrendered in payment of the exercise price of outstanding options granted under the 2006 Plan, or (c) withheld in satisfaction of tax withholding upon exercise of outstanding options granted under the 2006 Plan, and the number of shares of Class B common stock reserved under the amended and restated 2015 Plan was decreased, on a corresponding share for share basis, (2) no new awards of Class B common stock could be granted under the amended and restated 2015 Plan, and (3) except with respect to outstanding options granted under the 2006 Plan that were exercised on or after the date of the amendment and restatement, no Class B common stock could be issued under the 2015 Plan.

2015 Plan | Class B Common Stock

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

5,161,644

Number of additional shares authorized

802,562

2015 Plan | Class B Common Stock | Employee Stock Option

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares called by each instrument

2015 Plan | Class B Common Stock | RSUs

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares called by each instrument

2015 Plan | Class A Common Stock

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

3,181,740

Number of additional shares authorized

618,691

2015 Plan | Class A Common Stock | Employee Stock Option

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares called by each instrument

2015 Plan | Class A Common Stock | RSUs

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares called by each instrument

2017 Plan

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of additional shares authorized

4,065,466

4,070,921

6,000,000

Equity incentive plan, issuance of additional shares, description and terms

Unless determined otherwise by the Compensation Committee of the Board, as of the first trading day of January of each calendar year during the term of the 2017 Plan (excluding any extensions), eligible beginning with calendar year 2019, an additional number of shares of Class A common stock will be added to the number of shares of the Company’s Class A common stock authorized to be issued or transferred under the 2017 Plan and the number of shares authorized to be issued or transferred pursuant to incentive stock options, equal to 4% of the total number of shares of Class A common stock outstanding on the last trading day in December of the immediately preceding calendar year, or 6,000,000 shares, whichever is less, or such lesser amount as determined by the Board (the “Evergreen Increase”). The Compensation Committee of the Board determined to not effectuate the Evergreen Increase that was otherwise scheduled to have occurred on each of January 2, 2019, January 2, 2020, and January 4, 2021. On January 3, 2022, an additional 4,070,921 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase. On January 3, 2023, an additional 4,065,466 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase. On January 2, 2024, an additional 3,687,010 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase.

2017 Plan | Subsequent Event

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of additional shares authorized

3,687,010

2017 Plan | Class A Common Stock

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Equity incentive plan, additional shares authorized percentage

4.00%

Number of shares available for issuance during period

6,236,628

2017 Plan | Class A Common Stock | Maximum

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

12,300,000

2017 Plan | Class A Common Stock | Awarded Under 2017 Plan

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

7,800,000

2017 Plan | Class A Common Stock | Awarded Under 2015 Plan

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Number of shares authorized for issuances

4,500,000

2023 CarOffer Transaction | CO Incentive Units and Subject Units

Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]

Stock-based compensation expense

$ 20,655,000

[1]

As of December 31, 2023 and 2022, the aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of common stock on December 31, 2023 and 2022, respectively, or the date of exercise, as appropriate, and the exercise price of the underlying options.

Summary of Significant Accounting Policies - Additional Information (Details)				12 Months Ended
	Oct. 01, 2023 USD ($)	Apr. 01, 2023	Jan. 14, 2021 USD ($)	Dec. 31, 2023 USD ($) Customer	Dec. 31, 2022 USD ($) Customer	Dec. 31, 2021 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Write-offs in capitalized website development costs				$ 184,000
Description of significant off-balance sheet risk				The Company has no significant off-balance sheet risk, such as foreign exchange contracts, option contracts, or other foreign hedging arrangements.
Accounts receivable, net				$ 39,963,000	$ 46,817,000
Other than temporary impairments recognized in statements of operations				0	0	$ 0
Restricted cash				2,563,000	14,615,000
Impairment of goodwill	$ 0			0	0	0
Sublease income				$ 1,897,000	1,809,000	0
Minimum percentage of tax position realized upon settlement				50.00%
Unrecognized Tax Benefits				$ 812,000	$ 598,000	$ 0
Deferred tax expense on deferred tax assets and liabilities				$ 6,941,000
Percentage of corporate alternative minimum tax				15.00%
Effective tax rate				44.50%	27.70%	26.30%
Minimum average amount of adjusted financial income				$ 1,000,000,000
Number of consecutive tax year period				3 years
Percentage of excise tax imposed				1.00%
Federal tax rate				21.00%	21.00%	21.00%
Pillar Two Legislation
Summary Of Significant Accounting Policies [Line Items]
Effective tax rate				15.00%
Digital Wholesale
Summary Of Significant Accounting Policies [Line Items]
Write-offs in capitalized website development costs				$ 175,000
U.S. Marketplace
Summary Of Significant Accounting Policies [Line Items]
Write-offs in capitalized website development costs				8,000	$ 165,000	$ 2,481,000
CarOffer
Summary Of Significant Accounting Policies [Line Items]
Business acquisition, percentage of equity interest acquired			51.00%			51.00%
Aggregate consideration amount			$ 69,510,000
Caroffer Purchase Agreement \| CarOffer
Summary Of Significant Accounting Policies [Line Items]
Aggregate consideration amount				75,000,000
Trade Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable, net				853,000	632,000
Gross trade accounts receivable from receivables in transit from the third-party payment processor				2,868,000	7,122,000
Receivables offset by payments received in advance				$ 2,015,000	$ 6,490,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives				3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives				11 years
Maximum \| CarOffer
Summary Of Significant Accounting Policies [Line Items]
Business acquisition valuation period				1 year
Sales Revenue, Net \| Concentration of Credit Risk
Summary Of Significant Accounting Policies [Line Items]
Number of major customers \| Customer				0	0	0
Net Accounts Receivable \| Advertising Customers
Summary Of Significant Accounting Policies [Line Items]
Unbilled accounts receivable				$ 9,581,000	$ 7,150,000
Net Accounts Receivable \| Concentration of Credit Risk
Summary Of Significant Accounting Policies [Line Items]
Number of major customers \| Customer				0	1
Net Accounts Receivable \| Concentration of Credit Risk \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Number of major customers \| Customer				1,000	1,000
Net Accounts Receivable \| Concentration of Credit Risk \| Customer One
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, percentage				10.00%	13.00%
Net Accounts Receivable \| Concentration of Credit Risk \| Customer One \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, percentage				10.00%	10.00%
United States
Summary Of Significant Accounting Policies [Line Items]
Write-offs in capitalized website development costs					$ 165,000
UK
Summary Of Significant Accounting Policies [Line Items]
Federal tax rate		25.00%		19.00%
Website Development Costs
Summary Of Significant Accounting Policies [Line Items]
Write-offs in capitalized website development costs						$ 2,481,000
Software and website development costs capitalized				$ 20,789,000	14,496,000
Amortization expense				$ 11,537,000	7,637,000	3,705,000
Estimated useful life				3 years
Cost Of Revenue
Summary Of Significant Accounting Policies [Line Items]
Write-offs in capitalized website development costs						647,000
Internal Use Software
Summary Of Significant Accounting Policies [Line Items]
Software and website development costs capitalized				$ 4,850,000	4,388,000
Amortization expense				$ 3,384,000	1,286,000	272,000
Estimated useful life				3 years
Hosting Arrangements
Summary Of Significant Accounting Policies [Line Items]
Software and website development costs capitalized				$ 1,739,000	3,196,000
Amortization expense				$ 1,962,000	$ 2,117,000	$ 1,761,000

Segment and Geographic Information - Summary of Revenue by Geographical Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue by Geographic Region:
Total Revenue	$ 914,242	$ 1,655,035	$ 951,373
United States
Revenue by Geographic Region:
Total Revenue	863,289	1,610,400	909,033
International
Revenue by Geographic Region:
Total Revenue	$ 50,953	$ 44,635	$ 42,340

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-30

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

+ Details

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities - Schedule of Accrued Expenses, Accrued Income Taxes and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accrued Liabilities, Current [Abstract]
Accrued bonus	$ 15,247	$ 11,007
Other accrued expenses and other current liabilities	18,471	28,186
Total	$ 33,718	$ 39,193

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Share

For the years ended December 31, 2023, 2022, and 2021, a reconciliation of the numerator and denominator used in the calculation of basic and diluted net income (loss) per share is as follows:


	Year Ended December 31,
	2023			2022			2021
Numerator:
Consolidated net income	$	22,053		$	78,954		$	110,373
Net loss attributable to redeemable noncontrolling interest		(14,889	)		(5,433	)		1,129
Deemed dividend on redemption of noncontrolling interest		5,838			—			—
Accretion of redeemable noncontrolling interest to redemption value		—			(109,398	)		109,398
Net income (loss) attributable to common stockholders — basic	$	31,104		$	193,785		$	(154	)
Net loss attributable to redeemable noncontrolling interest		(14,889	)		(5,433	)		—
Deemed dividend on redemption of noncontrolling interest		5,838			—			—
Accretion of redeemable noncontrolling interest to redemption value		—			(109,398	)		—
Net income (loss) attributable to common stockholders — diluted	$	22,053		$	78,954		$	(154	)
Denominator:
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders — basic		113,240,139			118,474,991			117,142,062
Dilutive effect of share equivalents resulting from stock options		225,691			275,330			—
Dilutive effect of share equivalents resulting from unvested restricted stock units		723,004			366,258			—
Dilutive effect of share equivalents resulting from CO Incentive units, Subject Units, and noncontrolling interest		—			9,034,395			—
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders — diluted		114,188,834			128,150,974			117,142,062
Net income (loss) per share attributable to common stockholders:
Basic	$	0.27		$	1.64		$	(0.00	)
Diluted	$	0.19		$	0.62		$	(0.00	)

Schedule of Potentially Dilutive Common Stock Equivalents Excluded from Calculation of Diluted Weighted-average Shares Outstanding

For the years ended December 31, 2023, 2022, and 2021, potentially dilutive common stock equivalents that have been excluded from the calculation of diluted weighted‑average shares outstanding as their effect would have been anti‑dilutive are as follows:


	Year Ended December 31,
	2023		2022		2021
Stock options outstanding		551,196		587,494		617,504
Restricted stock units outstanding		2,333,489		2,634,463		2,867,330
CO Incentive Units, Subject Units and noncontrolling interest		—		—		1,509,750

Fair Value of Financial Instruments - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Dividend income from investment	$ 3,075,000
Investments		$ 0

Consolidated Statements of Redeemable Noncontrolling Interest and Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2020	$ 373,586			$ 94	$ 19	$ 242,181	$ 129,412	$ 1,880
Beginning balance, Shares at Dec. 31, 2020				94,310,309	19,076,500
Redeemable Noncontrolling Interest, Beginning balance at Dec. 31, 2020	0
Net (loss) income	109,244						109,244
Redeemable noncontrolling interest, net (loss) income	1,129
Stock–based compensation expense	56,772					56,772
Issuance of common stock upon exercise of stock options	663					663
Issuance of common stock upon exercise of stock options, Shares				222,147
Issuance of common stock upon vesting of restricted stock units				$ 2		(2)
Issuance of common stock upon vesting of restricted stock units, Shares				1,575,206
Payment of withholding taxes on net share settlements of restricted stock units	(15,388)					(15,388)
Payment of withholding taxes on net share settlements of restricted stock units, Shares		(527,237)		(527,237)
Conversion of common stock				$ 3
Conversion of common stock, shares issued				3,077,327
Conversion of common stock, shares converted					(3,077,327)
Conversion of common stock, value					$ (3)
Issuance of common stock upon for acquisition	103,645			$ 3		103,642
Issuance of common stock upon for acquisition, Shares				3,115,282
Acquisition of interest in CarOffer, LLC	60,982
Redeemable noncontrolling interest, accretion to redemption value	109,398
Accretion to redeemable noncontrolling interest redemption value	(109,398)						(109,398)
Tax distributions to redeemable noncontrolling interest holders	(8,701)
Foreign currency translation adjustment	(2,283)							(2,283)
Ending balance at Dec. 31, 2021	516,841			$ 102	$ 16	387,868	129,258	(403)
Ending balance, Shares at Dec. 31, 2021				101,773,034	15,999,173
Redeemable Noncontrolling Interest, Ending Balance at Dec. 31, 2021	162,808
Net (loss) income	84,387						84,387
Redeemable noncontrolling interest, net (loss) income	(5,433)
Stock–based compensation expense	59,245					59,245
Issuance of common stock upon exercise of stock options	721					721
Issuance of common stock upon exercise of stock options, Shares				131,061
Issuance of common stock upon vesting of restricted stock units				$ 1		(1)
Issuance of common stock upon vesting of restricted stock units, Shares				1,649,294
Payment of withholding taxes on net share settlements of restricted stock units	(16,025)					(16,025)
Payment of withholding taxes on net share settlements of restricted stock units, Shares		(566,267)		(566,267)
Repurchase of common stock	(18,717)			$ (1)		(18,716)
Repurchase of common stock, Shares				(1,350,473)
Redeemable noncontrolling interest, accretion to redemption value	(109,398)
Accretion to redeemable noncontrolling interest redemption value	109,398						109,398
Tax distributions to redeemable noncontrolling interest holders	(11,228)
Foreign currency translation adjustment	(1,241)							(1,241)
Ending balance at Dec. 31, 2022	734,609			$ 102	$ 16	413,092	323,043	(1,644)
Ending balance, Shares at Dec. 31, 2022		101,636,649	15,999,173	101,636,649	15,999,173
Redeemable Noncontrolling Interest, Ending Balance at Dec. 31, 2022	36,749
Net (loss) income	36,942						36,942
Redeemable noncontrolling interest, net (loss) income	(14,889)
Stock–based compensation expense	63,312					63,312
Issuance of common stock upon exercise of stock options	74					74
Issuance of common stock upon exercise of stock options, Shares				15,834
Issuance of common stock upon vesting of restricted stock units				$ 1		(1)
Issuance of common stock upon vesting of restricted stock units, Shares				2,440,510
Payment of withholding taxes on net share settlements of restricted stock units	(15,729)					(15,729)
Payment of withholding taxes on net share settlements of restricted stock units, Shares		(840,995)		(840,995)
Acquisition of interest in CarOffer, LLC	(21,838)
Acquisition of remaining interest in CarOffer, LLC	2,720					8,558	(5,838)
Repurchase of common stock	(205,819)			$ (11)		(205,808)
Repurchase of common stock, Shares				(11,076,755)
Tax distributions to redeemable noncontrolling interest holders	(22)
Foreign currency translation adjustment	743							743
Ending balance at Dec. 31, 2023	616,852			$ 92	$ 16	$ 263,498	$ 354,147	$ (901)
Ending balance, Shares at Dec. 31, 2023		92,175,243	15,999,173	92,175,243	15,999,173
Redeemable Noncontrolling Interest, Ending Balance at Dec. 31, 2023	$ 0

Revenue Recognition - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Performance obligation unsatisfied	$ 41,800
Revenue recognized	$ 12,249	$ 12,784	$ 9,137

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Employee Benefit Plans

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Employee Benefit Plans

15. Employee Benefit Plans

The Company maintains a defined contribution savings plan for all eligible U.S. employees under Section 401(k) of the Internal Revenue Code. For the year ended December 31, 2023 and 2022, the Company updated its matching policy, under which the Company matches 50% of an employee’s annual contributions to the 401(k) plan, up to a maximum of 8% of the employee’s base salary, bonus, and commissions paid during the year. For the year ended December 31, 2021, the Company matched 50% of an employee’s annual contributions to the 401(k) plan, up to a maximum of the lesser of (i) 6% of the employee’s base salary, bonus, and commissions paid during the year or (ii) $5,000. Matching contributions are subject to vesting based on the employee’s start date and length of service. Employees can designate the investment of their 401(k) accounts into several mutual funds. The Company does not allow investment in its common stock through the 401(k) plan.

The Company's subsidiary, CarOffer, maintains its own defined contribution savings plan for all eligible U.S. employees under Section 401(k) of the Internal Revenue Code. For the year ended December 31, 2023 and 2022, CarOffer matched 50% of a CarOffer employee’s annual contributions to the 401(k) plan, up to a maximum of the lesser of (i) 6% of the CarOffer employee’s base salary, bonus, and commissions paid during the year or (ii) $5,000. Matching contributions are subject to vesting based on the CarOffer employee’s start date and length of service. CarOffer employees can designate the investment of their 401(k) accounts into several mutual funds. For the year ended December 31, 2021, CarOffer did not have a defined contribution savings plan.

For the years ended December 31, 2023, 2022, and 2021, total employer contributions to the 401(k) plan were $6,575, $5,498, and $2,960, respectively.

Consolidated Statements of Redeemable Noncontrolling Interest and Stockholders' Equity (Parenthetical)	Dec. 31, 2021	Jan. 14, 2021
CarOffer
Business acquisition, percentage of equity interest acquired	51.00%	51.00%

Consolidated Income Statements - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Revenue

Total Revenue

$ 914,242

$ 1,655,035

$ 951,373

Cost of revenue

Total Cost of revenue

^[1]

262,788

997,482

294,015

Gross profit

651,454

657,553

657,358

Operating expenses:

Sales and marketing

304,070

336,708

290,574

Product, technology, and development

146,169

123,768

106,423

General and administrative

152,757

73,117

97,678

Depreciation and amortization

15,831

15,482

14,415

Total operating expenses

618,827

549,075

509,090

Income from operations

32,627

108,478

^[2]

148,268

^[2]

Other income, net:

Interest income

18,430

3,845

120

Other income (expense), net

630

(961)

972

Total other income, net

19,060

2,884

1,092

Income before income taxes

51,687

111,362

149,360

Provision for income taxes

29,634

32,408

38,987

Consolidated net income

22,053

78,954

110,373

Net (loss) income attributable to redeemable noncontrolling interest

(14,889)

(5,433)

1,129

Net (loss) income Attributable to CarGurus, Inc

36,942

84,387

109,244

Deemed dividend on redemption of noncontrolling interest

5,838

Accretion of redeemable noncontrolling interest to redemption value

(109,398)

109,398

Net income (loss) attributable to common stockholders - basic

$ 31,104

$ 193,785

$ (154)

Net income (loss) per share attributable to common stockholders: (Note 12)

Basic

$ 0.27

$ 1.64

$ 0

Diluted

$ 0.19

$ 0.62

$ 0

Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders:

Basic

113,240,139

118,474,991

117,142,062

Diluted

114,188,834

128,150,974

117,142,062

Marketplace

Revenue

Total Revenue

$ 698,236

$ 658,771

$ 636,942

Cost of revenue

Total Cost of revenue

^[1]

60,020

56,040

47,689

Wholesale

Revenue

Total Revenue

100,908

237,635

195,127

Cost of revenue

Total Cost of revenue

^[1]

90,066

176,446

127,679

Product

Revenue

Total Revenue

115,098

758,629

119,304

Cost of revenue

Total Cost of revenue

^[1]

$ 112,702

$ 764,996

$ 118,647

[1]

Includes depreciation and amortization expense for the years ended December 31, 2023, 2022, and 2021 of $32,643, $29,852, and $26,061, respectively.

[2]

As of December 31, 2022 and 2021, Digital Wholesale segment loss (income) did not reflect certain Dealer-to-Dealer and IMCO related capitalized website development expense from the U.S. Marketplace segment. During the three months ended March 31, 2023, the Company updated Digital Wholesale Depreciation and Amortization to reflect certain Dealer-to-Dealer and IMCO related capitalized website development amortization expense from the U.S. Marketplace segment and accordingly updated Digital Wholesale Depreciation as of December 31, 2022 and 2021 for comparative purposes.

Segment and Geographic Information - Summary of Assets by Segment (Details) - USD ($)
$ in Thousands

Dec. 31, 2023

Dec. 31, 2022

^[1]

Dec. 31, 2021

^[1]

Segment Reporting Information [Line Items]

Total assets

$ 918,927

$ 927,102

$ 931,574

U.S. Marketplace

Segment Reporting Information [Line Items]

Total assets

607,307

525,103

449,230

Digital Wholesale

Segment Reporting Information [Line Items]

Total assets

258,458

358,289

446,823

Other

Segment Reporting Information [Line Items]

Total assets

$ 53,162

$ 43,710

$ 35,521

[1]

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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-Section 45
-Paragraph 25
-Subparagraph (a)
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (SX 210.13-01(a)(4)(i))
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Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Summary of Changes in Allowance for Doubtful Accounts

As of December 31, 2023 and 2022, changes in the Company’s allowance for doubtful accounts are as follows:


	Balance at Beginning of Period		Provision		Write–offs, net of recoveries			Balance at End of Period
Year ended December 31, 2023	$	1,809	$	378	$	(1,577	)	$	610
Year ended December 31, 2022		420		1,769		(380	)		1,809

Schedule of Estimated Useful Lives of Property and Equipment

The estimated useful lives of the Company’s property and equipment are as follows:


		Estimated Useful Life (In Years)
Server and computer equipment		3
Capitalized internal-use software		3
Capitalized website development		3
Furniture and fixtures		3 to 5
Right-of-use assets		Lease term, or asset life if shorter
Leasehold improvements		Lease term, or asset life if shorter

Summary of Weighted Average Assumptions Utilized to Determine Fair Value of Options Granted

The weighted average assumptions utilized to determine the fair value of options granted during the year ended December 31, 2022 and 2021, are as follows:


	Year Ended December 31,			Year Ended December 31,
	2022			2021
Expected dividend yield		—			—
Expected volatility		48.03	%		50.95	%
Risk–free interest rate		1.47	%		0.69	%
Expected term (in years)	6.11				6.06

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
Consolidated Statements of Cash Flows - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Consolidated net income	$ 22,053,000	$ 78,954,000	$ 110,373,000
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	48,474,000	45,334,000	40,476,000
Gain on sale of property and equipment	(460,000)
Currency (gain) loss on foreign denominated transactions	(283,000)	155,000	(70,000)
Other non-cash expense, net	88,000
Deferred taxes	(37,864,000)	(22,114,000)	6,163,000
Provision for doubtful accounts	378,000	1,769,000	999,000
Stock-based compensation expense	63,737,000	54,777,000	53,525,000
Amortization of deferred financing costs	515,000	136,000	0
Amortization of deferred contract costs	11,817,000	11,067,000	12,653,000
Impairment of long-lived assets	184,000	165,000	3,128,000
Changes in operating assets and liabilities:
Accounts receivable	10,975,000	152,954,000	(174,771,000)
Inventory	1,958,000	14,374,000	(17,318,000)
Prepaid expenses, prepaid income taxes, and other assets	(1,498,000)	(6,573,000)	(5,068,000)
Deferred contract costs	(18,440,000)	(13,697,000)	(7,714,000)
Accounts payable	2,080,000	(35,047,000)	35,397,000
Accrued expenses, accrued income taxes, and other liabilities	(3,419,000)	(25,077,000)	35,817,000
Deferred revenue	9,067,000	(525,000)	3,661,000
Lease obligations	15,165,000	(546,000)	1,041,000
Net cash provided by operating activities	124,527,000	256,106,000	98,292,000
Investing Activities
Purchases of property and equipment	(24,563,000)	(5,924,000)	(7,713,000)
Proceeds from sale of property and equipment	460,000
Capitalization of website development costs	(16,648,000)	(11,346,000)	(6,163,000)
Cash paid for acquisitions, net of cash acquired			(64,273,000)
Purchases of short-term investments	(98,016,000)		(120,000,000)
Maturities of short-term investments		90,000,000	130,000,000
Sale of short-term investments	77,462,000
Advance payments to customers, net of collections	(259,000)
Net cash (used in) provided by investing activities	(61,564,000)	72,730,000	(68,149,000)
Financing Activities
Proceeds from issuance of common stock upon exercise of stock options	74,000	721,000	663,000
Payment of finance lease obligations	(70,000)	(68,000)	(39,000)
Payment of withholding taxes on net share settlements of restricted stock units	(15,597,000)	(16,022,000)	(15,388,000)
Repurchase of common stock	(208,524,000)	(14,428,000)
Repayment of line of credit			(14,250,000)
Payment of deferred financing costs		(2,578,000)
Payment of tax distributions to redeemable noncontrolling interest holders	(38,000)	(19,913,000)
Acquisition of remaining interest in CarOffer, LLC	(25,014,000)
Change in gross advance payments received from third-party transaction processor	(4,475,000)	(40,332,000)	46,822,000
Net cash (used in) provided by financing activities	(253,644,000)	(92,620,000)	17,808,000
Impact of foreign currency on cash, cash equivalents, and restricted cash	475,000	(364,000)	(597,000)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(190,206,000)	235,852,000	47,354,000
Cash, cash equivalents, and restricted cash at beginning of period	484,132,000	248,280,000	200,926,000
Cash, cash equivalents, and restricted cash at end of period	293,926,000	484,132,000	248,280,000
Supplemental disclosure of cash flow information:
Cash paid for income taxes	74,783,000	61,001,000	27,520,000
Cash paid for operating lease liabilities	19,504,000	17,548,000	16,168,000
Cash paid for interest	566,000	64,000
Supplemental noncash disclosure of cash flow information:
Unpaid purchases of property and equipment, capitalized website development, capitalized internal-use software and capitalized hosting arrangements	18,149,000	1,927,000	478,000
Unpaid repurchases of common stock		4,289,000
Unpaid excise tax on repurchases of shares	1,584,000
Capitalized stock-based compensation expense in website development and internal-use software costs and hosting arrangements	5,472,000	4,468,000	3,247,000
Obtaining a right-of-use asset in exchange for a finance lease liability			664,000
Obtaining a right-of-use asset in exchange for an operating lease liability	$ 149,185,000	9,845,000	12,336,000
Issuance of stock for acquisition			103,645,000
Accretion of redeemable noncontrolling interest to redemption value		(109,398,000)	109,398,000
Accrued tax distributions to redeemable noncontrolling interest holders		$ 16,000	$ 8,701,000

Stock-based Compensation - Summary of Stock Option Activity (Details) - Employee Stock Option - USD ($)
$ / shares in Units, $ in Thousands

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Common Stock

Outstanding, December 31, 2021

826,609

Options granted during period

30,266

619,618

Exercised

(15,834)

Forfeited or Expired

(34,681)

Outstanding, December 31, 2022

776,094

826,609

Exercisable

590,401

Weighted-Average Exercise Price for Equity

Unexercisable and exercisable outstanding, Beginning balance

$ 25.22

Exercised

4.69

Forfeited or Expired

35.61

Unexercisable and exercisable outstanding, Ending balance

25.17

$ 25.22

Exercisable

$ 21.83

Unexercisable and exercisable outstanding,

5 years 3 months 18 days

6 years 2 months 12 days

Exercisable

4 years 8 months 12 days

Aggregate Intrinsic Value

Unexercisable and exercisable outstanding, Beginning balance

^[1]

$ 3,172

Exercised

229

^[1]

$ 3,774

$ 6,027

Unexercisable and exercisable outstanding, Ending balance

^[1]

5,442

$ 3,172

Exercisable

^[1]

$ 5,442

[1]

2023 CarOffer Transaction

12 Months Ended

Dec. 31, 2023

Business Combination and Asset Acquisition [Abstract]

2023 CarOffer Transaction

4. 2023 CarOffer Transaction

Background

Pursuant to the 2021 Purchase Agreement, the Company acquired a 51% interest in CarOffer.

Upon the 2021 Closing, the Company acquired a 51% interest in CarOffer for the 2021 Total Consideration, which was an aggregate consideration of $173,155 consisting of (a) the 2021 Stock Consideration consisting of shares of Class A common stock in the aggregate amount of $103,645 and (b) the 2021 Cash Consideration consisting of $69,510 in cash. The number of shares of Class A common stock issued following the 2021 Closing in connection with the 2021 Stock Consideration was 3,115,282, which was calculated by reference to a value of $22.51 per share, which equals the volume-weighted average closing price per share of Class A common stock on the Nasdaq Global Select Market for the 28 consecutive trading days ending on the third Business Day (as defined in the 2021 Purchase Agreement) preceding the 2021 Agreement Date.

Pursuant to the 2021 Purchase Agreement, the Remaining Equity was retained by the then-current equity holders of CarOffer and subject to certain call and put arrangements discussed below. Pursuant to the 2021 Purchase Agreement, the Company established a retention pool in an aggregate amount of $8,000 in the form of RSUs to be issued pursuant to the Company’s standard form of RSU agreement under the 2017 Plan, (i) $6,000 of which was granted to certain CarOffer employees following the 2021 Closing in accordance with the terms of the 2021 Purchase Agreement and (ii) $2,000 of which is available for issuance to future CarOffer employees in accordance with the terms of the 2021 Purchase Agreement. RSUs issued from the retention pool will be subject to vesting based on rendering of future services.

As of December 31, 2023 and, 2022, the Company did not incur any transaction-related costs related to the 2021 CarOffer Transaction. As of December 31, 2021, the Company incurred total transaction-related costs of $2,647 related to the 2021 CarOffer Transaction, of which $709 was incurred for the year ended December 31, 2021, and recognized within general and administrative operating expenses in the consolidated income statements. Transaction-related costs were excluded from the purchase price allocation as they were primarily comprised of legal, professional, and consulting expenses.

The foregoing summary of the 2021 Purchase Agreement, the 2021 CarOffer Operating Agreement, and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the 2021 Purchase Agreement and the 2021 CarOffer Operating Agreement, which are filed as Exhibit 2.1 to the Annual Report on Form 10-K for the year ended December 31, 2020, filed on February 21, 2021, and Exhibit 10.27 to the Annual Report on Form 10-K for the year ended December 31, 2021, filed on February 25, 2022, respectively.

Completion of Acquisition

On December 1, 2023, the Company completed its previously announced acquisition of the remaining minority equity interests in CarOffer pursuant to the terms of the 2023 Purchase Agreement.

Pursuant to the 2023 Purchase Agreement, the Company acquired the remaining minority equity interests in CarOffer for the 2023 Consideration, consisting of an aggregate consideration of $75.0 million in cash, subject to certain adjustments set forth in the 2023 Purchase Agreement. A portion of the 2023 Consideration is held in escrow to secure certain payment and indemnification obligations of the Indirect Members in accordance with the terms of the 2023 Purchase Agreement.

Upon completion of the 2023 CarOffer Transaction, the Company recorded approximately a $50 million stock-based compensation charge, which consisted of payments for CO Incentive Units and Subject Units, and payments made to holders of noncontrolling interest ("Noncontrolling Interest Units"), resulting from the modification of the 2021 Purchase Agreement. The completion of the transaction additionally relieved the redeemable noncontrolling interests on its consolidated balance sheets, reducing the remaining redeemable noncontrolling interest on its consolidated balance sheets to zero and recording excess cash paid to these unit holders as a deemed dividend of $5,838. Refer to Note 11 to these consolidated financial statements for further disclosure on impact of the modifications that resulted from the 2023 CarOffer Transaction.

Following the 2023 CarOffer Transaction, CarOffer is a wholly-owned subsidiary and the Company entered into the 2023 CarOffer Operating Agreement, pursuant to which, among other matters, the existing put and call rights were terminated.

The foregoing summary of the 2023 Purchase Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the 2023 Purchase Agreement, which was filed as Exhibit 2.1 to the Company’s Current Report on Form 8-K, dated November 6, 2023, and filed on November 7, 2023.

The Company has incurred $1,044 of transaction-related costs, recognized within general and administrative, sales and marketing, and product, technology and development operating expenses in the consolidated income statements. These costs primarily consisted of legal and integration expenses associated with the 2023 CarOffer Transaction. There was no gain associated with the 2023 CarOffer Transaction.

Refer to Valuation of Acquired Assets and Liabilities policy within Note 2 of these consolidated financial statements for the Company's policy on the initial valuation of the assets and liabilities following the 2021 CarOffer Transaction. Refer to Stock-Based Compensation policy within Note 2 of these consolidated financial statements for the Company's policy on valuation of the liability-based awards that were accelerated and redeemed in connection with the 2023 CarOffer Transaction.

Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Summary of Revenue from Contracts with Customers by Services and Products

The following table summarizes revenue from contracts with customers by services and products for the year ended December 31, 2023, 2022, and 2021:


	Year Ended December 31,
	2023		2022		2021
Marketplace	$	698,236	$	658,771	$	636,942
Dealer-to-Dealer		109,802		320,119		224,831
Instant Max Cash Offer		106,204		676,145		89,600
Total	$	914,242	$	1,655,035	$	951,373

Income Taxes - Schedule of Income Tax Effect of Each Type of Temporary Difference and Carryforward (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Net operating loss carryforwards	$ 304	$ 461
Credit carryforwards	928	928
Stock-based compensation	5,353	5,441
Lease liability	47,907	13,557
Investment in partnership		8,325
Accruals and reserves	4,642	3,770
Intangible assets	20,294
Capitalized research and development	45,468	25,342
Deferred tax assets	124,896	57,824
Valuation Allowance	(305)	(258)
Valuation Allowance, net	124,591	57,566
Deferred tax liabilities:
Prepaid expenses	(2,459)	(2,466)
Deferred commissions	(5,531)	(4,200)
Right of use assets	(42,531)	(11,237)
Intangible assets		(733)
Capital lease	(72)
Property and equipment	(700)	(3,496)
Deferred tax liability	(51,293)	(22,132)
Net deferred tax assets	$ 73,298	$ 35,434

Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of Stock Option Activity

During the year ended December 31, 2023, stock option activity is as follows:


	Common Stock			Weighted- Average Exercise Price for Equity		Weighted- Average Remaining Contractual Life (In Years)		Aggregate Intrinsic Value(1)
Outstanding, December 31, 2022		826,609		$	25.22		6.2	$	3,172
Granted		—			—
Exercised		(15,834	)		4.69				229
Forfeited or Expired		(34,681	)		35.61
Outstanding, December 31, 2023		776,094		$	25.17		5.3	$	5,442
Exercisable as of December 31, 2023		590,401		$	21.83		4.7	$	5,442

(1)

Summary of Restricted Stock Unit Activity

During the year ended December 31, 2023, RSU activity is as follows:


	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Unvested outstanding, December 31, 2022		4,484,291		$	29.36	$	62,825
Granted		4,133,865			17.47
Vested		(2,440,510	)		26.83
Forfeited		(489,935	)		24.30
Unvested outstanding, December 31, 2023		5,687,711		$	22.02	$	137,415

Summary of Stock-based Compensation Expense by Award Type

For the year ended December 31, 2023, 2022, and 2021, stock-based compensation expense by award type and where the stock-based compensation expense was recognized in the Company’s consolidated income statements is as follows:


	Year Ended December 31,
	2023		2022			2021
Options	$	2,386	$	2,553		$	2,471
Restricted Stock Units		55,527		52,224			52,916
CO Incentive Units and Subject Units		26,552		(21,095	)		22,323
Noncontrolling Interest Units		28,991		—			—
Total	$	113,456	$	33,682		$	77,710

Summary of Allocation of Stock-based Compensation Expense


	Year Ended December 31,
	2023		2022		2021
Cost of revenue	$	2,370	$	475	$	417
Sales and marketing expense		13,710		7,733		12,801
Product, technology, and development expense		25,934		20,266		22,289
General and administrative expense		71,442		5,208		42,203
Total	$	113,456	$	33,682	$	77,710

Summary of Shares of Common Stock Reserved for Future Issuance

As of December 31, 2023, the Company had reserved the following shares of Class A common stock for future issuance:


Common stock options outstanding			776,094
Unvested restricted stock units outstanding			5,687,711
Shares available for issuance under the 2017 Plan			6,236,628
Total shares of authorized common stock reserved for future issuance			12,700,433

Segment and Geographic Information - Summary of Segment Revenue, Income (Loss) and Depreciation and Amortization (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Segment Reporting Information [Line Items]

Total Revenue

$ 914,242

$ 1,655,035

$ 951,373

Income (Loss) from Operations

32,627

108,478

^[1]

148,268

^[1]

Depreciation and Amortization

48,474

45,334

^[2]

40,476

^[2]

U.S. Marketplace

Segment Reporting Information [Line Items]

Total Revenue

647,284

614,136

594,602

Income (Loss) from Operations

127,724

128,455

^[1]

152,006

^[1]

Depreciation and Amortization

11,561

11,554

^[2]

10,648

^[2]

Digital Wholesale

Segment Reporting Information [Line Items]

Total Revenue

216,005

996,264

314,431

Income (Loss) from Operations

(96,383)

(11,834)

^[1]

6,526

^[1]

Depreciation and Amortization

36,265

33,350

^[2]

29,059

^[2]

Other

Segment Reporting Information [Line Items]

Total Revenue

50,953

44,635

42,340

Income (Loss) from Operations

1,286

(8,143)

^[1]

(10,264)

^[1]

Depreciation and Amortization

$ 648

$ 430

^[2]

$ 769

^[2]

[1]

[2]

As of December 31, 2022, Digital Wholesale Depreciation and Amortization did not reflect certain Dealer-to-Dealer and IMCO related capitalized website development expense from the U.S. Marketplace segment. During the three months ended March 31, 2023, the Company updated Digital Wholesale Depreciation and Amortization to reflect certain Dealer-to-Dealer and IMCO related capitalized website development amortization expense from the U.S. Marketplace segment and accordingly updated Digital Wholesale Depreciation as of December 31, 2022 and 2021 for comparative purposes.

- Definition

+ References

+ Details

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

7. Goodwill and Other Intangible Assets

Goodwill

As of December 31, 2023, changes in the carrying value of goodwill are as follows:


	U.S. Marketplace		Digital Wholesale		Other		Total
Balance as of December 31, 2022	$	12,477	$	130,451	$	14,539	$	157,467
Foreign currency translation adjustment		—		—		431		431
Balance as of December 31, 2023	$	12,477	$	130,451	$	14,970	$	157,898

The Company assessed its goodwill for impairment and did not identify any impairment as of December 31, 2023. Although no impairment was identified during the annual impairment test as of October 1, 2023, the excess of the fair value over the carrying value declined for the CarOffer reporting unit in the Digital Wholesale segment. If projected future operating results further decline, including as a result of economic conditions or operational challenges, the Company may need to record an impairment charge to reduce its goodwill at CarOffer which could be material and negatively affect the Company's operations.

Other Intangible Assets

As of December 31, 2023 and 2022, intangible assets consist of the following:


	As of December 31, 2023
	Weighted Average Remaining Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Accumulated Impairment		Net Carrying Amount
Brand		7.4	$	32,193	$	10,262	$	—	$	21,931
Customer relationships		0.0		19,870		19,620		—		250
Developed technology		0.0		65,212		63,690		647		875
Total			$	117,275	$	93,572	$	647	$	23,056


	As of December 31, 2022
	Weighted Average Remaining Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Accumulated Impairment		Net Carrying Amount
Brand		8.4	$	32,129	$	7,227	$	—	$	24,902
Customer relationships		1.0		19,870		13,609		—		6,261
Developed technology		1.0		65,212		42,674		647		21,891
Total			$	117,211	$	63,510	$	647	$	53,054

For the year ended December 31, 2023, 2022, and 2021, amortization of intangible assets was $30,062, $30,716, and $30,152, respectively.

For the year ended December 31, 2021, the Company wrote off $647 of U.S. Marketplace segment intangible assets within marketplace cost of revenue in the consolidated income statements related to certain developed technology which the Company decided to cease investment.

As of December 31, 2023, estimated amortization expense of intangible assets for future periods is as follows:


Year Ending December 31,	Amortization Expense
2024		4,162
2025		3,037
2026		3,037
2027		3,037
2028		3,037
Thereafter		6,746
Total	$	23,056

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Basis of Presentation

The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). Any reference in these notes to applicable guidance is meant to refer to GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”).

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Subsequent Event Considerations

The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the consolidated financial statements to provide additional evidence for certain estimates or to identify matters that require additional disclosure. The Company has evaluated all subsequent events and determined that there are no material recognized or unrecognized subsequent events requiring disclosure.

Use of Estimates

The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period.

Although the Company regularly assesses these estimates, actual results could differ materially from these estimates. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. Actual results may differ from management’s estimates if these results differ from historical experience, or other assumptions do not turn out to be substantially accurate, even if such assumptions are reasonable when made. Changes in estimates are recognized in the period in which they become known.

Critical estimates relied upon in preparing the consolidated financial statements include the determination of sales allowance and variable consideration in the Company’s revenue recognition, allowance for doubtful accounts, the impairment of long-lived assets, the capitalization of product, technology, and development costs for website development, internal-use software, and hosting arrangements, the valuation of acquired assets and liabilities, the valuation and recoverability of intangible assets and goodwill, the valuation of redeemable noncontrolling interest, the recoverability of the Company’s net deferred tax assets and related valuation allowance, the valuation of inventory, and the valuation of equity and liability-classified compensation awards. Accordingly, the Company considers these to be its critical accounting estimates and believes that of the Company’s significant accounting policies, these involve the greatest degree of judgment and complexity.

Concentration of Credit Risk

The Company has no significant off-balance sheet risk, such as foreign exchange contracts, option contracts, or other foreign hedging arrangements. Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, cash equivalents, short-term investments, trade accounts receivable, and other receivables.

The Company maintains its cash, cash equivalents, and short-term investments principally with accredited financial institutions of high credit standing. Although the Company deposits its cash, cash equivalents, and short-term investments with multiple financial institutions, its deposits with each such financial institution exceed governmental insured limits.

The Company routinely assesses the creditworthiness of its customers and does not require collateral. The Company generally has not experienced any material losses related to receivables from individual customers, or groups of customers. The majority of the Company's accounts receivable results from wholesale and product revenue transactions. The Company has had no material losses related to wholesale and product receivables as the third-party transaction processor does not release the title to the vehicle until successfully collecting funds from the buying dealer. Titling is handled by the Company's third-party transaction processor and titles are held in escrow until it collects funds from the buying dealer (i.e., title is legally transferred from the selling party to the buying party upon signing of bill of sale, but title is held in escrow by the third-party transaction processor until payment is received). Due to these factors, no additional credit risk beyond amounts provided for collection losses is believed by management to be probable in the Company’s accounts receivable and other receivables.

As of December 31, 2023, no customer accounted for more than 10% of net accounts receivable and other receivables. As of December 31, 2022, one customer accounted for 13% of net accounts receivable. The remainder of the accounts receivable was dispersed among more than 1,000 customers. The customer who accounted for greater than 10% of net accounts receivable is related to wholesale and product receivables. The collection risk associated with this customer is mitigated because, as discussed above, the third-party transaction processor does not release the title on vehicles until funds are successfully collected. Furthermore, there is no significant credit risk with respect to accounts receivable because, other than the receivables associated with this customer, credit risk with respect to accounts receivable is dispersed due to the large number of customers.

For the years ended December 31, 2023, 2022, and 2021, no individual customer accounted for more than 10% of total revenue.

Significant Accounting Policies

The consolidated financial statements reflect the application of certain significant accounting policies as described below and elsewhere in the notes of these consolidated financial statements.

Cash, Cash Equivalents, and Investments

As of December 31, 2023, cash and cash equivalents primarily consist of cash on deposit with banks, amounts held in interest‑bearing money market accounts, and mutual funds. As of December 31, 2022, cash and cash equivalents primarily consist of cash on deposit with banks, amounts held in interest-bearing money market accounts, and mutual funds.

Cash equivalents are carried at cost, which approximates their fair market value.

The Company’s investment policy, which was approved by the Audit Committee of the Company’s Board of Directors (the “Board”), permits investments in fixed income securities, including U.S. government and agency securities, non‑U.S. government securities, money market instruments, commercial paper, certificates of deposit, corporate bonds, and asset‑backed securities.

The Company considers all highly liquid investments with an original maturity of 90 days or less at the date of purchase to be cash equivalents. Investments not classified as cash equivalents with maturities less than one year from the balance sheet date are classified as short‑term investments, while investments with maturities in excess of one year from the balance sheet date are classified as long‑term investments. Management determines the appropriate classification of investments at the time of purchase, and re‑evaluates such determination at each balance sheet date.

Investments in equity securities with readily determinable fair values are recognized at fair value based on quoted market prices within investments in the consolidated balance sheets. Investments in held‑to‑maturity debt securities are recognized at amortized cost within short-term investments in the consolidated balance sheets. The Company adjusts the cost of investments in held-to-maturity debt securities for amortization of premiums and accretion of discounts to maturity, if any. Investments in trading and available-for-sale debt securities are recognized at fair value within investments in the consolidated balance sheets.

Purchases of equity securities and debt securities are recognized within investing activities in the consolidated statements of cash flows.

Dividend income from equity securities is recognized within interest income in the consolidated income statements. Reinvested proceeds from dividend income are recognized within purchases of investments in investing activities in the consolidated statements of cash flows.

The revaluation of equity securities and debt securities results in an unrealized gain or loss. Unrealized gains or losses on equity securities and trading debt securities are recognized within other income (expense), net in the consolidated income statements and adjusted for in operating activities in the consolidated statements of cash flows. Unrealized gains or losses on available-for-sale debt securities are recognized within other comprehensive income in the consolidated statements of comprehensive income. Interest on held-to-maturity debt securities is recognized within interest income in the consolidated income statements.

Proceeds from sale of equity securities and debt securities are recognized within investing activities in the consolidated statements of cash flows. Realized gains and losses on sale of equity securities and debt securities are recognized within other income (expense), net in the consolidated income statements, adjusted for in operating activities in the consolidated cash flows, and recognized within proceeds from sale of equity securities and debt securities in investing activities in the consolidated statements of cash flows.

Debt securities are reviewed for other‑than‑temporary impairment whenever the fair value of an investment is less than the amortized cost and evidence indicates that an investment’s carrying amount is not recoverable within a reasonable period of time. Other‑than‑temporary impairments of debt securities are recognized within other income (expense), net in the consolidated income statements if the Company has experienced a credit loss or if it is more likely than not that the Company will be required to sell the investment before recovery of the amortized cost basis. Evidence considered in this assessment includes reasons for the impairment, compliance with the Company’s investment policy, the severity and duration of the impairment, and changes in value subsequent to the end of the period. For the years ended December 31, 2023, 2022, and 2021, the Company determined that no other‑than‑temporary impairments were required to be recognized in the consolidated income statements.

As of December 31, 2023, the Company held short-term investments in equity securities.

As of December 31, 2022, the Company held no investments.

Restricted Cash

As of December 31, 2023, restricted cash was $2,563, and primarily related to pass-through payments from customers related to the Company's Digital Wholesale business. As of December 31, 2022, restricted cash was $14,615, and primarily related to cash held at a financial institution in an interest-bearing cash account as collateral for the letters of credit related to the contractual provisions for the Company’s building leases and pass-through payments from customers related to the Company’s Digital Wholesale business. As of December 31, 2023, all of restricted cash was classified as a short-term asset, as disclosed in the consolidated balance sheets. As of December 31, 2022, portions of restricted cash were classified as short-term assets and long-term assets, as disclosed in the consolidated balance sheets.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable is recorded based on the amount due from the customer and a third-party transaction processor. Accounts receivable do not bear interest.

The Company is exposed to credit losses primarily through its trade accounts receivable, which includes receivables in transit, net of payables due, from a third-party transaction processor. The third-party transaction processor collects customer payments on the Company's behalf and remits them to the Company. Customer payments received by the third-party transaction processor, but not remitted to the Company as of period end, are deemed to be receivables in transit, net of payables due. Additionally, the third-party transaction processor provides payments in advance for certain selling dealers. If the third-party transaction processor does not receive buying dealer payments associated with the transaction paid in advance, the Company would guarantee losses incurred by the third-party transaction processor and the balance would be deducted from future remittances to the Company. To date, losses associated with these guarantees have not been material.

The Company offsets trade accounts receivables in transit, net of payables due, from the third-party transaction processor with payments received in advance from the third-party transaction processor as it has the right of offset. At any point in time, the Company could have amounts due from the third-party transaction processor for funds the third-party transaction processor has collected from buying dealers and has not yet remitted to the Company (i.e., receivables in transit, net of payables due), as well as amounts paid by the third-party transaction processor to the Company in advance of collecting payments from buying dealers (i.e., payments received in advance). Therefore, as the Company has the right to offset, the Company can either have a net receivable balance due from the third-party transaction processor which is recognized within accounts receivable, net in the consolidated balance sheets, or the Company can have a net liability which is recognized within accrued expenses, accrued income taxes, and other current liabilities in the consolidated balance sheets if the advance payments exceed the receivable position from the third-party transaction processor as of the balance sheet date. Payments received in advance from the third-party transaction processor are presented as cash flows from financing activities in the consolidated statements of cash flows.

As of December 31, 2023, trade accounts receivable from receivables in transit, net of payables due, from the third-party transaction processor was $2,868, offset by payments received in advance of $2,015, which resulted in a net receivable of $853 recognized within accounts receivable, net in the consolidated balance sheets. As of December 31, 2022, trade accounts receivable from receivables in transit, net of payables due, from the third-party transaction processor was $7,122, offset by payments received in advance of $6,490, which resulted in a net receivable of $632 recognized within accounts receivable, net in the consolidated balance sheets.

As of December 31, 2023 and 2022, $9,581 and $7,150, respectively, was included in net accounts receivable, representing unbilled accounts receivable relating primarily to both advertising customers invoiced in the period subsequent to services rendered and revenue recognition adjustments for Company offered discounts given to dealers in accordance with ASC Topic 606, Revenue from Contracts with Customers ("ASC 606").

Provisions for allowances for doubtful accounts are recognized within general and administrative expense in the consolidated income statements. Amounts are charged against the allowance after all means of collection have been exhausted, the potential for recovery is considered remote, and when it is determined that expected credit losses may occur. The Company does not have any off‑balance sheet credit exposure related to its customers. Unbilled accounts receivable generally relate to services rendered in the current period, but not invoiced until the subsequent period.

As of December 31, 2023 and 2022, changes in the Company’s allowance for doubtful accounts are as follows:


	Balance at Beginning of Period		Provision		Write–offs, net of recoveries			Balance at End of Period
Year ended December 31, 2023	$	1,809	$	378	$	(1,577	)	$	610
Year ended December 31, 2022		420		1,769		(380	)		1,809

Inventory

The Company’s inventory consists of inventory acquired through Instant Max Cash Offer ("IMCO") transactions, at other marketplaces, or in certain situations across all transactions, during arbitrations. The inventory is recognized in the consolidated balance sheets and is valued at the lower of cost or net realizable value. Cost is determined based on specific identification. In recording inventory at the lower of cost or net realizable value, the Company estimates potential future losses on inventory on hand based on historical losses and market trends. Estimated potential future losses on inventory may vary from actual results which could lead to material adjustments to the consolidated financial statements.

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation and amortization using the straight‑line method over the estimated useful lives of the assets. Leasehold improvements and right-of-use assets are amortized over the lease term, or the estimated useful life of the related asset, if shorter. The estimated useful lives of the Company’s property and equipment are as follows:


		Estimated Useful Life (In Years)
Server and computer equipment		3
Capitalized internal-use software		3
Capitalized website development		3
Furniture and fixtures		3 to 5
Right-of-use assets		Lease term, or asset life if shorter
Leasehold improvements		Lease term, or asset life if shorter

Expenditures for repairs and maintenance are charged to expense as incurred, whereas major betterments are capitalized as additions to property and equipment.

Impairment of Long-Lived Assets

Impairment of Long‑Lived Assets

The Company evaluates the recoverability of long‑lived assets, such as property and equipment and intangible assets, for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. During this review, the Company re-evaluates the significant assumptions used in determining the original cost and estimated lives of long-lived assets. Although the assumptions may vary from asset to asset, they generally include operating results, changes in the use of the asset, cash flows, and other indicators of value. Management then determines whether the remaining useful life continues to be appropriate, or whether there has been an impairment of long‑lived assets based primarily upon whether expected future undiscounted cash flows are sufficient to support the assets’ recovery. Recoverability of these assets is measured by comparison of the carrying amount of the asset to the future undiscounted cash flows the asset is expected to generate. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset.

For the year ended December 31, 2023, the Company wrote off a total of $184 of capitalized website development costs, consisting of $175 in Digital Wholesale and $8 in U.S. Marketplace, within wholesale and marketplace cost of revenue, respectively, in the consolidated income statements related to certain developed technology in which the Company decided to cease investment. For the year ended December 31, 2022, the Company wrote off $165 of Digital Wholesale segment capitalized website development costs within wholesale cost of revenue in the consolidated income statements related to certain developed technology in which the Company decided to cease investment. For the year ended December 31, 2021, the Company wrote off $2,481 of U.S. Marketplace segment capitalized website development costs within operating expense in the consolidated income statements and $647 of U.S. Marketplace segment intangible assets within marketplace cost of revenue in the consolidated income statements related to certain developed technology in which the Company decided to cease investment.

Capitalized Website Development and Capitalized Internal-Use Software Costs

The Company capitalizes certain costs associated with the development of its websites and internal‑use software after the preliminary project stage is complete and until the website development or software is ready for its intended use. Research and development costs incurred during the preliminary project stage or costs incurred for data conversion activities, training, maintenance, and general and administrative, or overhead costs are expensed as incurred. Capitalization begins when the preliminary project stage is complete, management authorizes and commits to the funding of the project with the required authority, it is probable the project will be completed, the website development or software will be used to perform the functions intended, and certain functional and quality standards have been met. Qualified costs incurred during the operating stage of its website development or software relating to upgrades and enhancements are capitalized to the extent it is probable that they will result in added functionality, while costs that cannot be separated between maintenance of, and minor upgrades and enhancements to, websites and internal‑use software are expensed as incurred. Capitalized website development and capitalized internal-use software costs are recognized within property and equipment, net in the consolidated balance sheets.

Capitalized website development and capitalized internal-use software costs are amortized on a straight‑line basis over their estimated useful life of three years beginning with the time when the product is ready for intended use. Amortization expenses related to capitalized website development costs are recognized within cost of revenue in the consolidated income statements. Amortization expenses related to capitalized internal-use software costs are recognized within the operating expense caption for depreciation and amortization in the consolidated income statements. The Company evaluates the useful lives of these assets when each asset is ready for its intended use, and at least annually thereafter to ensure three years remains appropriate. The Company also tests for impairment at least annually and whenever events or changes in circumstances occur that could impact the recoverability of these assets. Impairment is evaluated as discussed in the “Impairment of Long-lived Assets” section above.

During the years ended December 31, 2023 and 2022, capitalized website development costs were $20,789 and $14,496, respectively. During the years ended December 31, 2023 and 2022, capitalized internal-use software costs were $4,850 and $4,388, respectively.

For the years ended December 31, 2023, 2022, and 2021, amortization expense associated with capitalized website development costs were $11,537, $7,637, and $3,705, respectively. For the years ended December 31, 2023, 2022, and 2021, amortization expense associated with capitalized internal-use software costs was $3,384, $1,286, and $272, respectively.

Capitalized Hosting Arrangements

The Company's hosting arrangements consist of cloud-based hosting platforms. Capitalized implementation costs for hosting arrangements costs are recognized within prepaid expenses, prepaid income taxes and other current assets and within other non-current assets, as applicable, in the consolidated balance sheets.

Capitalized implementation costs for hosting arrangements are amortized on a straight‑line basis over an estimated useful life of the term of the hosting arrangement, taking into consideration several other factors such as, but not limited to, options to extend the hosting arrangement or options to terminate the hosting arrangement, beginning with the time when the software is ready for intended use. Amortization expenses related to hosting arrangements costs are recognized within the same line item in the consolidated income statements as the expense for fees for the associated hosting arrangement. The Company evaluates the useful lives of these assets when each asset is ready for its intended use, and at least annually thereafter to ensure the selected useful life remains appropriate. The Company also tests for impairment at least annually and whenever events or changes in circumstances occur that could impact the recoverability of these assets. Impairment is evaluated as discussed in the “Impairment of Long-lived Assets” section above.

During the years ended December 31, 2023, 2022, 2021, the Company launched separate initiatives designed to enhance its hosting arrangements related to its enterprise applications. During the years ended December 31, 2023 and 2022, capitalized implementation costs were $1,739 and $3,196, respectively, and recognized within other non-current assets and within prepaid expenses, prepaid income taxes and other current assets, respectively, in the consolidated balance sheets.

For the years ended December 31, 2023, 2022, and 2021, amortization expense associated with hosting arrangements was $1,962, $2,117, and $1,761, respectively, and recognized within operating expense and cost of revenue in the consolidated income statements.

Business Combinations

Valuation of Acquired Assets and Liabilities

The Company measures all consideration transferred in a business combination at its acquisition-date fair value. Consideration transferred is determined by the acquisition-date fair value of assets transferred, liabilities assumed, including contingent consideration obligations, as applicable. The Company measures goodwill as the excess of the consideration transferred over the net of the acquisition-date amounts of assets acquired less liabilities assumed.

The Company makes significant assumptions and estimates in determining the fair value of the acquired assets and liabilities as of the acquisition date, especially the valuation of intangible assets and certain tax positions. The Company records estimates as of the acquisition date and reassess the estimates at each reporting period up to one year after the acquisition date. Changes in estimates made prior to finalization of purchase accounting are recognized within goodwill.

Intangible Assets

Intangible assets are recognized at their estimated fair value at the date of acquisition. Fair value is determined based on inputs and assumptions such as discount rates, rates of return on assets, and long-term sales growth rates.

The Company amortizes intangible assets over their estimated useful lives on a straight-line basis. Useful lives are established based on analysis of all pertinent factors such as: the expected use of the asset; expected useful lives of related assets; provisions that may limit the useful life; historical experience with similar arrangements; effects of economic factors; demand; competition; obsolescence; and maintenance required to maintain the future cash flows. Amortization is recognized over the relevant estimated useful lives ranging from three to eleven years.

The Company evaluates the useful lives of these assets as of the acquisition date and at least annually thereafter to ensure the selected useful life remains appropriate. If the estimate of an intangible asset’s remaining useful life is changed, the Company amortizes the remaining carrying value of the intangible asset prospectively over the revised remaining useful life.

The Company monitors its long-lived assets for impairment indicators on an ongoing basis in accordance with GAAP, and tests for impairment at least annually and whenever events or changes in circumstances occur that could impact the recoverability of these assets. If impairment indicators exist, the Company performs the required impairment analysis by comparing the undiscounted cash flows expected to be generated from the long-lived assets to the related net book values. Impairment is evaluated as discussed in the “Impairment of Long-Lived Assets” section above.

Goodwill

Goodwill is recognized when consideration paid in a purchase acquisition exceeds the fair value of the net assets acquired. Goodwill is not amortized, but rather is tested for impairment annually or more frequently if facts and circumstances warrant a review. Conditions that could trigger a more frequent impairment assessment include, but are not limited to, a significant adverse change in certain agreements, significant underperformance relative to historical or projected future operating results, an economic downturn affecting automotive marketplaces, increased competition, a significant reduction in the Company's stock price for a sustained period, or a reduction of its market capitalization relative to net book value.

The Company evaluates impairment annually on October 1 by comparing the estimated fair value of each reporting unit to its carrying value. For fiscal year 2023 the Company determined that it had three reporting units with goodwill: U.S. Marketplace, CarOffer, and U.K. Marketplace. The Company elected to bypass the optional qualitative test for impairment and proceed to Step 1, which is a quantitative impairment test. For the U.S. Marketplace and U.K. Marketplace reporting units, the Company estimates fair value using a market approach, based on market multiples derived from public companies that are identified as peers. As of October 1, 2023, the Company estimated forecasted revenue for fiscal year 2023, and estimated revenue market multiples using publicly available information for each of its reporting units. Developing these assumptions required the use of judgment and estimates. Actual results may differ from these forecasts. For the CarOffer reporting unit, the Company estimates fair value using an income approach, based on a discounted cash flow method. The assumptions used to estimate the fair value using a discounted cash flow method include revenue and EBITDA forecasts, the weighted average cost of capital and discount rate, debt-free net working capital forecasts, and long-term growth rate.

For the years ended December 31, 2023, 2022, and 2021 the Company did not identify any impairment of its goodwill. Although no impairment was identified during the annual impairment test as of October 1, 2023, the excess of the fair value over the carrying value declined for the CarOffer reporting unit in the Digital Wholesale segment. If projected future operating results further decline, including as a result of economic conditions or operational challenges, the Company may need to record an impairment charge to reduce its goodwill at CarOffer which could be material and negatively affect the Company's operations.

Redeemable Noncontrolling Interest

In connection with the Company’s acquisition of a 51% interest in CarOffer on January 14, 2021, the Company became a party with the noncontrolling equity holders of CarOffer to the 2021 CarOffer Operating Agreement (as defined in "Stock-Based Compensation" below), which, among other matters, sets forth certain put and call rights described in "Stock-Based Compensation" below. The 2021 CarOffer Operating Agreement provided the Company with the right to purchase, and the noncontrolling equity holders with the right to sell to the Company, the noncontrolling CarOffer equity holders’ equity interests in CarOffer at a contractually defined formulaic purchase price, which was based on a multiple of earnings.

Subsequent to the Company’s acquisition of the 51% interest on January 14, 2021, the redeemable noncontrolling interest was measured at the greater of the amount that would be paid if settlement occurred as of the balance sheet date based on the contractually defined redemption value and its carrying amount adjusted for net (loss) income attributable to the noncontrolling interest and tax distributions to redeemable noncontrolling interest holders. Adjustments to the carrying value of the redeemable noncontrolling interest resulting from changes in the redemption value are recognized within retained earnings in the consolidated balance sheets.

On November 6, 2023, the Company entered into a Membership Interest Purchase Agreement (the “2023 Purchase Agreement”) with CarOffer, CarOffer Investors Holding, LLC, CarOffer Midco, LLC (“CarOffer MidCo”), each of the persons set forth on Schedule 1.1(a) to the 2023 Purchase Agreement (the “Indirect Members”), Bruce T. Thompson, an individual residing in Texas, as the sellers’ representative, and the responsible party signatory thereto.

Pursuant to the 2023 Purchase Agreement the Company acquired the remaining minority equity interests in CarOffer (the “2023 CarOffer Transaction”) for an aggregate consideration of $75.0 million in cash (the “2023 Consideration”), subject to certain adjustments set forth in the 2023 Purchase Agreement. A portion of the 2023 Consideration is held in escrow to secure certain payment and indemnification obligations of the Indirect Members in accordance with the terms of the 2023 Purchase Agreement. The 2023 CarOffer Transaction was completed on December 1, 2023.

Following the 2023 CarOffer Transaction, CarOffer is a wholly-owned subsidiary and the Company entered into the Fourth Amended and Restated Limited Liability Company Agreement, dated December 1, 2023 (the "2023 CarOffer Operating Agreement"), pursuant to which, among other matters, the existing put and call rights were terminated. As a result of the Company purchasing the remaining minority equity interests of CarOffer, there is no redeemable noncontrolling interest as of December 31, 2023.

See Note 4 of these consolidated financial statements for further information regarding the 2023 CarOffer Transaction.

Leases

The Company recognizes a lease liability for the obligation to make lease payments and a right-of-use asset for the right to use the underlying assets for the lease term. The Company reviews all material contracts for embedded leases to determine if they have a right-of-use asset. The Company made an accounting policy election to apply the practical expedient under ASC Topic 842, Leases, to not separate lease components from non-lease components for all leases.

The Company recognizes rent expense on a straight-line basis over the lease period. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. The Company allocates lease costs across all departments based on headcount in the respective location.

Variable lease payments that depend on an index or a rate are included in the lease payments and are measured using the prevailing index or rate at the measurement date. Variable lease payments not based on an index or a rate are excluded from lease payments and are expensed as incurred.

The Company made an accounting policy election to not recognize a lease liability or right-of-use asset on its consolidated balance sheets for leases with an initial term of twelve months or less, and instead to recognize lease payments in the consolidated income statements on a straight-line basis over the lease term and variable lease payments that do not depend on an index or rate as expense in the period in which the achievement of the specified target that triggers the variable lease payments becomes probable.

The Company recognizes sublease income on a straight-line basis over the sublease period. The Company recognizes sublease income as an offset to rent expense within operating expenses in the consolidated income statements as subleasing is not a primary business activity of the Company and is meant to offset occupancy costs. For the years ended December 31, 2023 and 2022, the Company recognized sublease income of $1,897 and $1,809, respectively. For the year ended December 31, 2021, there was no sublease income.

Contingent Liabilities

The Company has certain contingent liabilities that arise in the ordinary course of business activities. The Company accrues for loss contingencies when losses become probable and can be reasonably estimated. If the reasonable estimate of the loss is a range and no amount within the range is a better estimate, the minimum amount of the range is recognized as a liability. The Company does not accrue for contingent losses that, in its judgment, are considered to be reasonably possible, but not probable; however, it discloses the range of such reasonably possible losses, if material.

Income Taxes

The Company is subject to federal and state income taxes in the U.S. and taxes in foreign jurisdictions in which it operates. For the years ended December 31, 2023 and 2022, a provision for income taxes was recognized as a result of the consolidated taxable income position.

The Company accounts for income taxes in accordance with the asset and liability method. Under this method, deferred tax assets and liabilities are recognized based on temporary differences between the financial reporting and income tax bases of assets and liabilities using enacted tax rates in effect for the year in which the temporary differences are expected to be recovered or settled.

This method requires a valuation allowance against net deferred tax assets if, based upon the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. In performing this analysis, the Company considers future taxable income and ongoing prudent and feasible tax planning strategies to assess realizability. Actual results may differ from these forecasts. Valuation allowances are reassessed periodically to determine whether it is more likely than not that the tax benefits will be realized in the future and if any existing valuation allowance should be released. As of December 31, 2023 and 2022, valuation allowances were immaterial.

The Company accounts for uncertain tax positions by prescribing a more‑likely‑than‑not threshold for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company assesses its income tax positions and recognizes an income tax benefit or expense within the provision for income taxes in the consolidated income statements based upon management’s evaluation of the facts, circumstances, and information available at the reporting date. The tax position is measured as the largest amount of benefit or expense that is greater than 50% likely of being realized upon ultimate settlement with the taxing authority during examination. The Company recognizes interest and penalties, if applicable, related to uncertain tax positions as income tax expense within other income (expense), net in the consolidated income statements. The Company recognizes liabilities related to uncertain tax positions within accrued expenses, accrued income taxes and other current liabilities, and other non-current liabilities in the consolidated balance sheets, as applicable, depending on if the uncertainty is expected to be resolved within one year or more. The ultimate resolution of these tax positions may be greater or less than the liabilities recognized.

For the year ended December 31, 2023, income tax expense and liability related to uncertain tax positions, exclusive of immaterial interest or penalties related to uncertain tax provisions was $812, which would favorably affect the Company's effective tax rate, if recognized. For the year ended December 31, 2022, income tax expense and liability related to uncertain tax positions, exclusive of immaterial interest or penalties related to uncertain tax provisions was $598.

On October 3, 2023, the State of Massachusetts passed a tax relief bill changing its apportionment formula from three-factors to a single factor effective January 1, 2025. The Company evaluated the impact from the enacted bill and recognized $6,941 deferred tax expense on its U.S. deferred tax assets and liabilities in 2023.

The Organisation for Economic Co-operation and Development introduced an international tax framework under Pillar Two which includes a global minimum tax of 15%. Pillar Two legislation has been enacted or substantively enacted in certain jurisdictions where the Company operates. The Pillar Two legislation will be effective for the Company's fiscal year beginning January 1, 2024. The Company has performed an assessment of its potential exposure to Pillar Two income taxes based on the Company's most recent tax filings, country-by-country reporting, and financial statements for the constituent entities within the Company. Based on the assessment performed, the Pillar Two effective tax rates in all jurisdictions in which the Company operates are above 15%. However, there are a limited number of jurisdictions where the transitional safe harbor relief does not apply, and the Pillar Two effective tax rate is close to 15%. The Company does not expect a material exposure to Pillar Two income taxes in those jurisdictions.

The Tax Cuts and Jobs Act of 2017 subjects a U.S. stockholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. An entity can make an accounting policy election, per the FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, either to recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. The Company has elected to account for GILTI as a period cost in the year the tax is incurred.

The Inflation Reduction Act of 2022 (the "IRA") was passed into law on August 16, 2022. The provisions of the IRA were effective beginning with fiscal year 2023, with certain exceptions. The IRA had several new provisions including a 15% corporate alternative minimum tax for certain large corporations that have at least an average of $1.0 billion of adjusted financial statement income over a consecutive three-tax-year period. The IRA also introduced a 1% excise tax imposed on certain stock repurchases by publicly traded U.S. corporations made after December 31, 2022. The Company has appropriately considered the impacts of the 1% excise tax on its income tax provision and cash taxes in 2023. Based on the Company’s evaluation, the Company concludes that the IRA has not had a material impact on its income tax provision and cash taxes.

Under the U.K. Finance Act 2022 that was granted on February 24, 2022, U.K. corporation tax rate has been increased from 19% to 25% effective April 1, 2023. The Company evaluated the rate change impact and recognized immaterial deferred tax expense on its U.K. deferred tax assets and liabilities in 2022. No additional tax expense related to the impact of the tax rate change on deferred tax assets and liabilities was necessary in 2023.

The Company will continue to monitor the changes in tax laws and regulations to evaluate their potential impact on its business.

Fair Value of Financial Instruments

The Company measures eligible assets and liabilities at fair value with changes in value recognized in earnings. Fair value treatment may be elected either upon initial recognition of an eligible asset or liability or, for an existing asset or liability, if an event triggers a new basis of accounting. During the years ended December 31, 2023 and 2022, the Company did not elect to remeasure any of its existing financial assets and did not elect the fair value option for any financial assets transacted.

ASC Topic 820, Fair Value Measurements and Disclosures ("ASC 820"), establishes a three‑level valuation hierarchy for instruments measured at fair value that distinguishes between assumptions based on market data (observable inputs) and the Company’s own assumptions (unobservable inputs). Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset or liability, and are developed based on the best information available in the circumstances.

ASC 820 identifies fair value as the exchange price or exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants based on the highest and best use of the asset or liability. As such, fair value is a market‑based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. The Company uses valuation techniques to measure fair value that maximize the use of observable inputs and minimize the use of unobservable inputs. These inputs are prioritized as follows:

Level 1 — Quoted unadjusted prices for identical instruments in active markets.

Level 2 — Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model‑derived valuations in which all observable inputs and significant value drivers are observable in active markets.

Level 3 — Model‑derived valuations in which one or more significant inputs or significant value drivers are unobservable, including assumptions developed by the Company.

The Company has evaluated the estimated fair value of financial instruments using available market information. The use of different market assumptions, estimation methodologies, or both, could have a significant effect on the estimated fair value amounts.

As of December 31, 2023 and 2022, the carrying amounts of the Company’s financial instruments, which include cash and cash equivalents, short-term investments, accounts receivable, accounts payable, and accrued expenses approximated their fair values due to the short‑term nature of these instruments.

Debt

The Company may obtain access to capital via credit facilities. The amount of borrowings outstanding on credit facilities are recognized within other current liabilities or other non-current liabilities in the consolidated balance sheets, depending on the borrowing base. Costs for unutilized revolving commitments and interest for outstanding borrowings are recognized as interest expense within other income (expense), net in the consolidated income statements. Interest payments are recognized within operating activities in the consolidated statements of cash flows, and repayments of principle amounts are recognized within financing activities in the consolidated statements of cash flows.

As of December 31, 2023, there were no borrowings and $9,627 in letters of credit outstanding under the 2022 Revolver (as defined in Note 9 of these consolidated financial statements), which reduces the borrowing capacity under the 2022 Revolver to $390,373.

As of December 31, 2023, commitment fees under the 2022 Revolver were immaterial.

Deferred Financing Costs

The Company capitalizes certain legal and other third-party fees that are directly associated with obtaining access to capital via credit facilities. Deferred financing costs incurred in connection with obtaining access to capital are recognized within other non-current assets in the consolidated balance sheets and within financing activities in the consolidated statements of cash flows. These costs are amortized on a straight-line basis over the term of the applicable credit facility and recognized as interest expense within other income (expense), net in the consolidated income statements and as an adjustment to consolidated net income in the consolidated statements of cash flows.

As of December 31, 2023 and 2022, deferred financing costs were $1,927 and $2,442, respectively, recognized within other non-current assets in the consolidated balance sheets. As of December 31, 2021, no deferred financing costs were recognized.

For the years ended December 31, 2023 and 2022, amortization expense associated with deferred financing costs were $515 and $136, respectively, within other income (expense), net in the consolidated income statements. For the year ended December 31, 2021, no amortization expense associated with deferred financing costs was recognized.

Foreign Currency Translation

The reporting currency of the Company is the U.S. dollar. The functional currency of the Company’s foreign subsidiaries is the local currency of each subsidiary. All assets and liabilities in the balance sheets of entities whose functional currency is a currency other than the U.S. dollar are translated into U.S. dollar equivalents at exchange rates as follows: (i) asset and liability accounts at period‑end rates; (ii) income statement accounts at weighted‑average exchange rates for the period; and (iii) stockholders’ equity accounts at historical exchange rates. The resulting translation adjustments are excluded from consolidated net income and are recognized within accumulated other comprehensive (loss) income in the consolidated balance sheets.

Foreign currency transaction gains and losses are included in consolidated net income for the period. The Company's foreign subsidiaries have intercompany transactions that are eliminated upon consolidation, and these transactions expose the Company to foreign currency exchange rate fluctuations. Exchange rate fluctuations on short‑term intercompany transactions are recognized in other income (expense), net in the consolidated income statements. Exchange rate fluctuations on long-term intercompany transactions are recognized within accumulated other comprehensive loss in the consolidated balance sheets.

Revenue Recognition

Sources of Revenue

The Company derives its revenue from marketplace revenue, wholesale revenue, and product revenue. Marketplace revenue is included in the U.S. Marketplace segment and Other category of segment reporting. Wholesale revenue and product revenue are included in the Digital Wholesale segment. The Company generates marketplace revenue primarily from (i) dealer subscriptions to the Company's Listings packages, Real-time Performance Marketing ("RPM"), digital advertising suite, Digital Retail, and Sell My Car - Top Dealer Offers ("TDO"), (ii) advertising revenue from auto manufacturers and other auto‑related brand advertisers, and (iii) revenue from partnerships with financing services companies. The Company generates wholesale revenue primarily from (x) transaction fees earned from facilitating the purchase and sale of vehicles between dealers ("Dealer-to-Dealer transactions"), (y) transaction fees earned from the sale of vehicles to dealers that it acquires at other marketplaces, and (z) transaction fees earned from performing inspection and transportation services, inclusive of Dealer-to-Dealer transactions, other marketplace to dealer transactions, and IMCO transactions (as defined below). The Company generates product revenue primarily from (A) aggregate proceeds received from the sale of vehicles to dealers that were acquired directly from customers or, or Instant Max Cash Offer ("IMCO transactions"), and (B) proceeds received from the sale of vehicles that were acquired through arbitration.

Revenue Recognition

ASC 606 outlines a comprehensive five-step revenue recognition model based on the principle that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, the Company applies the following five steps:

1) Identify the contract with a customer

2) Identify the performance obligations in the contract

3) Determine the transaction price

4) Allocate the transaction price to performance obligations in the contract

5) Recognize revenue when or as the Company satisfies a performance obligation

Marketplace Revenue - Description

The Company offers multiple types of marketplace Listings packages to its dealers for its CarGurus U.S. platform (availability varies on the Company's other marketplaces): Restricted Listings, which is free; and various levels of Listings packages, which each require a paid subscription under a monthly, quarterly, semiannual, or annual subscription basis.

The Company’s subscriptions for customers generally auto-renew on a monthly basis and are cancellable by dealers with 30 days’ advance notice prior to the commencement of the applicable renewal term. Subscription pricing is determined based on a dealer’s inventory size, region, and the Company's assessment of the connections and return on investment ("ROI") the platform will provide them and is subject to discounts and/or fee reductions that the Company may offer from time to time. The Company also offers all dealers on the platform access to its Dealer Dashboard, which includes a performance summary, Dealer Insights tool, and user review management platform. Only dealers subscribing to a paid Listings package have access to the Pricing Tool, Market Analysis tool, and IMV Scan tool.

The Company offers paid Listings packages for the Autolist and PistonHeads websites.

In addition to displaying inventory in the Company's marketplace and providing access to the Dealer Dashboard, the Company offers dealers subscribing to certain of its Listings packages other subscription advertising and customer acquisition products and enhancements marketed under the Company's RPM and digital advertising suite. Through RPM, dealers can buy advertising that appears in the Company's marketplace, on other sites on the internet, and/or on high-converting social media platforms. Such advertisements can be targeted by the user’s geography, search history, CarGurus website activity, and a number of other targeting factors, allowing dealers to increase their visibility with in-market consumers and drive qualified traffic for dealers.

The Company also offers dealer advertising products for the PistonHeads website.

The Company also offers dealers subscribing to certain of its Listings packages other subscription advertising and customer acquisition products and enhancements such as Digital Retail, which allows shoppers to complete much of the vehicle-purchase process online through the Dealers’ Listings page. Digital Retail is comprised of (i) the Digital Deal Platform, which gives dealers higher quality leads through upfront consumer-provided information, (ii) Geo Expansion, which expands the visibility of a dealer’s inventory in the search results beyond its local market, and (iii) Hard Pull Financing, which provides loan information.

The Company also offers dealers subscribing to certain of its Listings packages other subscription advertising and customer acquisition products and enhancements such as TDO, which allows dealers to pay for leads to receive direct access to shoppers actively looking to sell their vehicles. Dealers can acquire inventory from shoppers who are looking to sell directly through the CarGurus Sell My Car page.

Marketplace revenue also consists of non-dealer advertising revenue from auto manufacturers and other auto-related brand advertisers sold on a cost per thousand impressions basis ("CPM basis"). An impression is an advertisement loaded on a web page. In addition to advertising sold on a CPM basis, the Company also has advertising sold on a cost-per-click basis. Pricing is primarily based on advertisement size and position on the Company’s websites and mobile applications. Auto manufacturers and other brand advertisers can execute advertising campaigns that are targeted across a wide variety of parameters, including demographic groups, behavioral characteristics, specific auto brands, categories such as Certified Pre-Owned, and segments such as hybrid vehicles. The Company does not provide minimum impression guarantees or other types of minimum guarantees in its contracts with customers. Advertising is also sold indirectly through revenue sharing arrangements with advertising exchange partners.

The Company also offers non-dealer advertising products for the Autolist and PistonHeads websites.

Marketplace revenue also includes revenue from partnerships with certain financing services companies pursuant to which the Company enables eligible consumers on the Company's CarGurus U.S. website to pre-qualify for financing on cars from dealerships that offer financing through such companies. The Company primarily generates revenue from these partnerships based on the number of funded loans from consumers who pre-qualify with its lending partners through its site.

Marketplace Revenue - Revenue Recognition

For Listings, Digital Retail, RPM, and TDO, the Company provides a single similar service each day for a period of time. Each time increment (i.e., one day), rather than the underlying activities, is distinct and substantially the same and therefore the performance obligation of the Company is to provide a series of daily activities over the contract term. Similar to the dealer listings, the dealer advertising is considered a promise to provide a single similar service each day. Each time increment is distinct and substantially the same and therefore the performance obligation of the Company is to provide a series of daily activities over the contract term.

Total consideration for marketplace revenue is stated within the contracts. There are no contractual cash refund rights, but credits may be issued to a customer at the sole discretion of the Company. Dealer customers do not have the right to take possession of the Company’s software. At the portfolio level, there is also variable consideration that needs to be included in the transaction price. Variable consideration consists of sales allowances, usage fees, and concessions that change the transaction price of the unsatisfied or partially unsatisfied performance obligation. The Company recognizes that there are times when there is a customer satisfaction issue or other circumstances that will lead to a credit. Due to the known possibility of future credits, a monthly sales allowance review is performed to defer revenue at a portfolio level for such future adjustments in the period of incurrence. The Company establishes sales allowances at the time of revenue recognition based on its history of adjustments and credits provided to its customers. In assessing the adequacy of the sales allowance, the Company evaluates its history of adjustments and credits made through the date of the issuance of the consolidated financial statements. Estimated sales adjustments, credits, and losses may vary from actual results which could lead to material adjustments to the consolidated financial statements. Sales allowances are recognized as a reduction to revenue in the consolidated income statements.

Performance obligations are satisfied over time as the customer simultaneously receives and consumes the benefit of the service. Revenue is recognized ratably over the subscription period beginning on the date the Company starts providing services to the customer under the contract. Revenue is presented net of any taxes collected from customers. Customers are billed in advance on the first day of each calendar month with payment terms generally 30 to 60 days from the date invoiced. Billings are recognized as accounts receivable or short-term deferred revenue when payment is received in advance of services being delivered to the customers.

For non-dealer advertising revenue from auto manufacturers and other auto-related brand advertisers, the performance obligation is to publish the agreed upon campaign on the Company’s websites and load the related impressions.

Advertising contracts state the transaction price within the agreement with payment generally being based on the number of clicks or impressions delivered on the Company’s websites. Total consideration is based on output and deemed variable consideration constrained by an agreed upon delivery schedule and is allocated to the period in which the service was rendered. Additionally, there are generally no contractual cash refund rights. Certain contracts do contain the right for credits in situations in which impressions are not displayed in compliance with contractual specifications. At an individual contract level, the Company may give a credit for a customer satisfaction issue or other circumstance. Due to the known possibility of future credits, a monthly review is performed to defer revenue at an individual contract level for such future adjustments in the period of incurrence. Although these credits have not been material and have not changed significantly over the historical period, estimated sales adjustments, credits, and losses may vary from actual results which could lead to material adjustments to the consolidated financial statements.

Performance obligations for Company-sold advertising revenue and partner-sold advertising revenue are satisfied over time as impressions are delivered. Revenue is recognized based on the total number of impressions delivered within the specified period. Revenue from advertising sold directly by the Company is recognized based on the gross amount charged to the advertiser because the Company is the principal in the arrangement as it controls the ad placement and timing of the campaign, establishes the selling price, and is directly responsible for the fulfillment of the contractual terms including any remedy for issues with such fulfillment. Revenue from advertising sold by partners is recognized based on the net amount of revenue received from the content partners because the Company is the agent in the arrangement as the advertising partner is responsible for fulfillment, including the acceptability of the services delivered. In partner-sold advertising arrangements, the advertising partner has a direct contractual relationship with the advertiser. There is no contractual relationship between the Company and the advertiser for partner-sold transactions. Additionally, for auction-based partner agreements, the Company has latitude in establishing the floor price, but the final price established by the exchange server is at market rates. Revenue is presented net of any taxes collected from customers. Customers are billed monthly in arrears with payment terms generally 30 to 60 days from the date invoiced. Unbilled accounts receivable generally relate to services rendered in the current period, but not invoiced until the subsequent period.

Other marketplace revenue includes revenue from contracts for which the performance obligation is a series of distinct services with the same level of effort daily. For these contracts, primarily related to the Company’s partnerships with financing services companies, the Company estimates the value of the variable consideration in determining the transaction price and allocates it to the performance obligation. Revenue is estimated and recognized on a ratable basis over the contractual term. The Company reassesses the estimate of variable consideration at each reporting period.

Wholesale Revenue - Description

The CarOffer Matrix enables buying dealers to create standing buy orders and provides instant offers to selling dealers. Wholesale revenue includes transaction fees earned from Dealer-to-Dealer transactions, where the Company collects fees from both the buying and selling dealers. The Company also sells vehicles to dealers that it acquires at other marketplaces, where it collects a transaction fee from the buying dealers.

Wholesale revenue also includes fees earned from performing inspection and transportation services, where it collects fees from the buying dealer. Inspection and transportation service revenue is inclusive of Dealer-to-Dealer transactions, other marketplace to dealer transactions, and IMCO transactions.

Wholesale revenue also includes fees earned from certain guarantees offered to dealers (which include 45-Day Guarantee and OfferGuard products), where the Company collects fees from the buying dealer or selling dealer, as applicable. Guarantee revenue is not accounted for under ASC 606 and is accounted for under ASC Topic 460, Guarantees (“ASC 460”), as discussed further in Note 2 of these consolidated financial statements.

Wholesale Revenue - Revenue Recognition

When facilitating Dealer-to-Dealer transactions and for vehicles sold to dealers that are acquired at other marketplaces, the Company does not control the vehicle and therefore acts as an agent in the transaction. Revenue earned from the fees for facilitating these transactions is recognized at a point in time when the vehicle is sold on a net basis.

For inspection and transportation services, the Company leverages a network of third-party inspection service providers and transportation carriers. The Company controls both inspection and transportation services as it is primarily responsible for fulfillment and therefore acts as a principal in the transaction. Revenue from fees for inspection services is recognized at the point in time when the inspection is performed and revenue from fees for transportation services is recognized over time as delivery is completed. Revenue from both inspection and transportation services is recognized on a gross basis. Unearned revenue related to unsatisfied performance obligations is recognized as deferred revenue.

Wholesale revenue also includes arbitration in which the vehicle is rematched to a new buyer and not acquired by the Company. Arbitration is the process by which the Company investigates and resolves claims from buying dealers. In these situations, the Company does not control the vehicle and therefore acts as an agent in the transaction. Revenue from a rematch transaction is recognized in line with fee revenue relating to the facilitation of the transaction, inspection services, and transportation services above.

Within wholesale transactions, there are typically no contractual cash refund rights, but credits may be issued to a customer at the sole discretion of the Company and refunds may be required by law in the case of a vehicle defect. At the portfolio level, there is also variable consideration that needs to be included in the transaction price. Variable consideration consists of sales allowances and concessions that change the transaction price of the unsatisfied or partially unsatisfied performance obligation. The Company recognizes that there are times when there is a customer satisfaction issue or other circumstance that will lead to a credit or arbitration. The Company establishes sales allowances at the time of revenue recognition based on its history of adjustments and credits provided to its customers. In assessing the adequacy of the sales allowance, the Company evaluates its history of adjustments and credits made through the date of the issuance of the consolidated financial statements. Upon recognizing a sales transaction, the Company estimates the amount of transaction price that will be reversed in a subsequent period and records a reserve for returns and cancellations in other current assets and other current liabilities in the consolidated balance sheets. Estimated sales adjustments, credits, and losses may vary from actual results which could lead to material adjustments to the consolidated financial statements. Sales allowances are recognized as a reduction to revenue in the consolidated income statements and an increase to other current assets and other current liabilities and a reduction to accounts receivable, net in the consolidated balance sheets. Wholesale revenue is also offset by concessions.

Wholesale revenue is presented net of any taxes collected from customers.

Typically, customers are billed upon successful matching of a buyer and seller, with payment due upon receipt.

Product Revenue - Description

The CarOffer Matrix enables consumers who are selling vehicles to be instantly presented with an offer. Product revenue includes the aggregate proceeds received from the sale of vehicles through IMCO transactions, including vehicle sale price and transaction fees collected from the buying dealers. Product revenue also includes proceeds received from the sale of vehicles acquired through arbitration, including vehicle sale price and transaction fees collected from buying dealers. Arbitration is the process by which the Company investigates and resolves claims from buying dealers. The Company controls the vehicle in these transactions and therefore acts as the principal.

Product - Revenue Recognition

For vehicles sold to dealers that are acquired through IMCO transactions, the Company controls the vehicle and therefore acts as a principal in the transaction. Revenue earned from proceeds received on the sale of vehicles through IMCO transactions, including vehicle sale price and transaction fees collected from the buying dealers, is recognized at a point in time when the vehicle is sold on a gross basis.

In certain situations across all transactions, during an arbitration process the Company acquires vehicles in transactions in which it controls the vehicle and therefore acts as a principal in the transaction. Revenue earned from the sale of the vehicle in these transactions is recognized at a point in time on a gross basis.

Within product transactions, there are typically no contractual cash refund rights, but credits may be issued to a customer at the sole discretion of the Company and refunds may be required by law in the case of a vehicle defect. At the portfolio level, there is also variable consideration that needs to be included in the transaction price. Variable consideration consists of sales allowances and concessions that change the transaction price of the unsatisfied or partially unsatisfied performance obligation. The Company recognizes that there are times when there is a customer satisfaction issue or other circumstance that will lead to a credit or arbitration. The Company establishes sales allowances at the time of revenue recognition based on its history of adjustments and credits provided to its customers. In assessing the adequacy of the sales allowance, the Company evaluates its history of adjustments and credits made through the date of the issuance of the consolidated financial statements. Upon recognizing a sales transaction, the Company estimates the amount of transaction price that will be reversed in a subsequent period and records a reserve for returns and cancellations in other current assets and other current liabilities in the consolidated balance sheets. Estimated sales adjustments, credits, and losses may vary from actual results which could lead to material adjustments to the consolidated financial statements. Sales allowances are recognized as a reduction to revenue and cost of revenue in the consolidated income statements and an increase to other current assets and other current liabilities and a reduction to accounts receivable, net in the consolidated balance sheets. Product revenue is also offset by concessions.

Product revenue presented net of any taxes collected from customers.

Typically, customers are billed upon successful matching of a buyer and seller, with payment due upon receipt.

Contracts with Multiple Performance Obligations

The Company periodically enters into arrangements that include Listings and/or dealer advertising product subscriptions within marketplace revenue. These contracts include multiple promises that the Company evaluates to determine if the promises are separate performance obligations. Performance obligations are identified based on services to be transferred to a customer that are distinct within the context of the contractual terms. Once the performance obligations have been identified, the Company determines the transaction price, which includes estimating the amount of variable consideration to be included in the transaction price, if any. If required, the transaction price is allocated to each performance obligation in the contract based on a relative standalone selling price method as the performance obligation is being satisfied. For the Company’s arrangements that include Listings and/or dealer advertising product subscriptions, the performance obligations were satisfied over a consistent period of time and therefore the allocations did not impact the revenue recognized.

For wholesale and product arrangements that include multiple performance obligations, the Company allocates revenue based on fair value. Vehicle and inspection revenues are recognized at a point in time and transportation revenue is recognized over time.

Costs to Obtain a Contract

Commissions paid to sales representatives and payroll taxes are considered costs to obtain a contract. Under ASC 606, the costs to obtain a contract require capitalization and amortization of those costs over the period of benefit. Although the guidance specifies the accounting for an individual contract with a customer, as a practical expedient, the Company has opted to apply the guidance to a portfolio of contracts with similar characteristics. The Company has opted to apply another practical expedient to immediately expense the incremental cost of obtaining a contract when the underlying related asset would have been amortized over one year or less. As such, the Company applied this practical expedient to advertising contracts and wholesale and product transactions as the term is one year or less and these contracts do not renew automatically. The practical expedient is not applicable to marketplace subscription contracts as the period of benefit including renewals is anticipated to be greater than one year. The assets are periodically assessed for impairment.

For marketplace subscription customers, the commissions paid on contracts with new customers, in addition to any commission amount related to incremental sales, are capitalized and amortized over the estimated benefit period of the customer relationship taking into account factors such as peer estimates of technology lives and customer lives as well as the Company's own historical data. Commissions paid that are not directly related to obtaining a new contract are expensed as incurred.

Additionally, the Company allocates employer payroll tax expense to the commission expense in proportion to the overall payroll taxes paid during the respective period. As such, capitalized payroll taxes are amortized in the same manner as the underlying capitalized commissions.

As of December 31, 2023 and 2022, assets associated with costs to obtain a contract were $24,093 and $17,394, respectively. For the years ended December 31, 2023, 2022, and 2021, amortization expense associated with costs to obtain a contract was $11,817, $11,067 and $12,653, respectively.

Deferred Revenue

Deferred revenue primarily consists of payments received in advance of revenue recognition from the Company’s marketplace revenue and is recognized as the revenue recognition criteria are met. The Company generally invoices its customers monthly. Accordingly, the deferred revenue balances do not represent the total contract value of annual or multiyear subscription agreements. Deferred revenue that is expected to be recognized during the succeeding 12‑month period is recognized as current deferred revenue and the remaining portion is recognized as noncurrent in the consolidated balance sheets. All deferred revenue was recognized as current for all periods presented.

Marketplace Cost of Revenue

Marketplace cost of revenue includes expenses related to supporting and hosting marketplace service offerings. These expenses include personnel and related expenses for the Company's customer support team, including salaries, benefits, incentive compensation, and stock-based compensation; third-party service provider expenses such as advertising, data and hosting expenses; amortization of developed technology; amortization of capitalized website development; amortization of capitalized hosting arrangements; and allocated overhead expenses. The Company allocates overhead expenses, such as rent and facility expenses, information technology expense, and employee benefit expense, to all departments based on headcount. As such, general overhead expenses are reflected in cost of revenue and each operating expense category.

Wholesale Cost of Revenue

Wholesale cost of revenue includes expenses related to supporting and hosting Digital Wholesale service offerings, including Dealer-to-Dealer transactions and vehicles sold to dealers acquired at other marketplaces on the CarOffer Matrix. These expenses include vehicle transportation and inspection expenses; net losses on vehicles related to guarantees offered to dealers through Dealer-to-Dealer transactions; personnel and related expenses for employees directly involved in the fulfillment and support of transactions, including salaries, benefits, incentive compensation, and stock-based compensation; third-party service provider expenses; amortization of developed technology; amortization of capitalized website development; and allocated overhead expenses. The Company allocates overhead expenses, such as rent and facility expenses, information technology expense, and employee benefit expense, to all departments based on headcount. As such, general overhead expenses are reflected in cost of revenue and each operating expense category.

Product Cost of Revenue

Product cost of revenue includes expenses related to vehicles sold to dealers through IMCO transactions and vehicles sold to dealers acquired through arbitration. These expenses include the cost of the vehicle and transportation expenses.

Guarantees and Indemnification Obligations

In the ordinary course of business, the Company enters into agreements with its customers, partners, and service providers that include commercial provisions with respect to licensing, infringement, guarantees, indemnification, and other common provisions.

The Company provides certain guarantees to dealers through products such as its 45-Day Guarantee and OfferGuard service offerings on the CarOffer platform, which are accounted for under ASC 460.

45-Day Guarantee is an arrangement through which a selling dealer lists a car on the CarOffer platform, and the Company provides an offer to purchase the vehicle listed at a specified price at any time over a 45-day period. This provides the seller with a put option, where they have the right, but not the obligation, to require the Company to purchase the vehicle during this window. OfferGuard is an arrangement through which a buying dealer purchases a car on the CarOffer platform, and the Company provides an offer to purchase the vehicle at a specified price between days 1 and 3, and days 42 and 45 if the dealer is not able to sell the vehicle after 42 days.

A guarantee liability is initially measured using the amount of consideration received from the dealer for the purchase of the guarantee. The initial liability is released, and guarantee income is recognized, upon the earliest of the following: the vehicle sells during the guarantee period, the seller exercises its put option during the guarantee period, or the option expires unexercised at the end of the guarantee period. Guarantee income is recognized within wholesale revenue in the consolidated income statements. When it is probable and reasonably estimable that the Company will incur a loss on a vehicle that it is required to purchase, a liability and a corresponding charge to wholesale cost of revenue is recognized for the amount of the loss in the consolidated balance sheets and the consolidated income statements. Gains and losses resulting from the dealers exercise of guarantees are recognized within wholesale cost of revenue, as appropriate, in the consolidated income statements.

For the years ended December 31, 2023, 2022, and 2021, income for guarantees purchased by dealers was $1,890, $10,026, and $5,537, respectively. For the years ended December 31, 2023 and 2022, the losses, net of gains recognized within cost of revenue in the consolidated income statements resulting from the dealers' exercise of guarantees were $417 and $4,568, respectively. For the year ended December 31, 2021, the net loss resulting from the dealers' exercise of guarantees was immaterial.

As of December 31, 2023, the maximum potential amount of future payments that the Company could be required to make under these guarantees was $10,158. Of the maximum potential amount of future payments, the losses that are probable are not material. As such, as of December 31, 2023, the Company had no material contingent loss liabilities.

As of December 31, 2022, the maximum potential amount of future payments that the Company could be required to make under these guarantees was $31,056. Of the maximum potential amount of future payments, the losses that are probable are not material. As such, as of December 31, 2022, the Company had no material contingent loss liabilities.

As of December 31, 2021, the maximum potential amount of future payments that the Company could be required to make under these guarantees was $76,075. Of the maximum potential amount of future payments, none were considered probable. The exercise of guarantees has historically been infrequent and even when such exercises did occur, the losses were not material. As such, as of December 31, 2021, the Company had no contingent loss liabilities.

Stock-Based Compensation

Stock‑Based Compensation

For stock‑based awards granted under the Company’s stock‑based compensation plans, the fair value of each award is determined on the date of grant.

For restricted stock units (“RSUs”) granted subject to service-based vesting conditions, the fair value is determined on the date of grant using the closing price of the Company’s Class A common stock, par value $0.001 per share (the “Class A common stock”), as reported on the Nasdaq Global Select Market. RSUs granted subject to service-based vesting conditions generally vest over a four-year requisite service period.

For RSUs granted subject to market-based vesting conditions, the fair value is determined on the date of grant using the Monte Carlo simulation lattice model. The determination of the fair value using this model is affected by the Company's stock price performance relative to the companies listed on the S&P 500, and a number of assumptions including volatility, correlation coefficient, risk-free interest rate, and expected dividends. RSUs previously granted subject to market-based vesting conditions vest upon achievement of specified levels of market conditions. During the year ended December 31, 2022, the Company modified its market-based performance awards to contain only service-based vesting conditions in line with the Company's other RSU awards. As a result, there were no market-based RSUs outstanding as of December 31, 2023 or December 31, 2022.

For stock options granted, the fair value is determined on the date of grant using the Black‑Scholes option‑pricing model. The determination of the fair value is affected by the Company’s stock price and a number of assumptions including expected dividend yield, expected volatility, risk-free interest rate, and expected term. For expected volatility, the Company uses a blended volatility to combine the historical volatility of trading with the volatility for a peer group of companies as the Company does not have historical stock prices for a period that is at least equal to the expected term. Stock options granted generally have a term of ten years from the date of grant and generally vest over a four-year requisite service period.

There were no options granted during the year ended December 31, 2023.

The weighted average assumptions utilized to determine the fair value of options granted during the year ended December 31, 2022 and 2021, are as follows:


	Year Ended December 31,			Year Ended December 31,
	2022			2021
Expected dividend yield		—			—
Expected volatility		48.03	%		50.95	%
Risk–free interest rate		1.47	%		0.69	%
Expected term (in years)	6.11				6.06

On January 14, 2021, the Company acquired a 51% interest in CarOffer (the "2021 CarOffer Transaction") pursuant to the terms of a Membership Interest Purchase Agreement (the “2021 Purchase Agreement”) dated as of December 9, 2020 (the “2021 Agreement Date”), as amended, by and among the Company, CarOffer, CarOffer Investors Holding, LLC (“TopCo”), each of the Members of TopCo (each a “Member” and collectively, the “Members”), and Bruce T. Thompson, an individual residing in Texas.

Upon consummation of the transactions contemplated by the 2021 Purchase Agreement (the “2021 Closing”), the Company acquired a 51% interest in CarOffer for an aggregate consideration of $173,155 (the “2021 Total Consideration”), such 2021 Total Consideration consisting of (a) shares of Class A common stock in the aggregate amount of $103,645 (the “2021 Stock Consideration”) and (b) $69,510 in cash (the “2021 Cash Consideration”). The number of shares of Class A common stock issued following the 2021 Closing in connection with the 2021 Stock Consideration was 3,115,282, which was calculated by reference to a value of $22.51 per share, which equals the volume-weighted average closing price per share of Class A common stock on the Nasdaq Global Select Market for the 28 consecutive trading days ending on the third Business Day (as defined in the 2021 Purchase Agreement) preceding the 2021 Agreement Date. Pursuant to the 2021 Purchase Agreement, the remaining equity in CarOffer (the “Remaining Equity”) was retained by the then-current equity holders of CarOffer and subject to certain call and put arrangements discussed below.

Pursuant to the 2021 Purchase Agreement, the Company established a retention pool in an aggregate amount of $8,000 in the form of RSUs to be issued pursuant to the Company’s standard form of RSU agreement under the Company’s Omnibus Incentive Compensation Plan (the "2017 Plan"), (i) $6,000 of which was granted to certain CarOffer employees following the 2021 Closing in accordance with the terms of the 2021 Purchase Agreement and (ii) $2,000 of which is available for issuance to future CarOffer employees in accordance with the terms of the 2021 Purchase Agreement. RSUs issued from the retention pool will be subject to vesting based on rendering of future services.

In addition, the Company, TopCo, each Member, and CarOffer MidCo, LLC entered into the Second Amended and Restated Limited Liability Company Agreement, dated as of December 9, 2020 (the “2020 CarOffer Operating Agreement”), pursuant to which, among other matters, the Company secured the right to appoint a majority of the members of the Board of Managers of CarOffer, other rights customary for a transaction of this nature, and the put and call rights described below. On November 23, 2021, the 2020 CarOffer Operating Agreement was amended and restated for administrative purposes, including principally to recapitalize certain of the membership units thereunder without changing overall consideration payable by the Company thereunder (the “2021 CarOffer Operating Agreement”).

In the second half of 2022, the Company had a call right (the “2022 Call Right”), exercisable in its sole discretion, to acquire a portion of the Remaining Equity representing up to twenty-five percent (25%) of the fully diluted capitalization of CarOffer (such acquired Remaining Equity, the “2022 Acquired Remaining Equity”) at an implied CarOffer value (the “2022 Call Right Value”) of seven (7) times CarOffer’s trailing twelve months gross profit as of June 30, 2022 (calculated in accordance with the defined terms and subject to the adjustments set forth in the 2021 CarOffer Operating Agreement, included as Exhibit 10.27 to the Annual Report on Form 10-K for the year ended December 31, 2021, filed on February 25, 2022). During the year ended December 31, 2022, the Company determined not to exercise the 2022 Call Right.

Prior to the 2023 CarOffer Transaction, in the second half of 2024, (a) the Company had a call right (the “2024 Call Right”), exercisable in its sole discretion, to acquire all, and not less than all, of the Remaining Equity that it had not yet acquired pursuant to the 2022 Call Right and the 2021 Closing, at the greater of (i) (x) one hundred million dollars ($100,000,000), and (y) the 2022 Call Right Value, whichever was less, and (ii) an implied CarOffer value of twelve (12) times CarOffer’s trailing twelve months EBITDA as of June 30, 2024 (in each case calculated in accordance with the defined terms and subject to the adjustments set forth in the 2021 CarOffer Operating Agreement), and (b) the representative of the holders of the Remaining Equity had a put right (the “2024 Put Right”), exercisable in his, her or their sole discretion, to have the holders of the Remaining Equity sell to the Company, all, and not less than all, of the Remaining Equity at an implied CarOffer value of twelve (12) times CarOffer’s trailing twelve months EBITDA as of June 30, 2024 (calculated in accordance with the defined terms and subject to the adjustments set forth in the 2021 CarOffer Operating Agreement). In connection with the 2023 CarOffer Transaction, as defined in Note 4 of these consolidated financial statements, the 2024 Call Right and the 2024 Put Right were terminated.

The foregoing summary of the 2021 Purchase Agreement, the 2021 CarOffer Operating Agreement, and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the 2021 Purchase Agreement and the 2021 CarOffer Operating Agreement, which are included as Exhibit 2.1 to the Annual Report on Form 10-K for the year ended December 31, 2020, filed on February 21, 2021, and Exhibit 10.27 to the Annual Report on Form 10-K for the year ended December 31, 2021, filed on February 25, 2022, respectively.

In connection with the 2021 CarOffer Transaction, the then-outstanding unvested incentive units (“CO Incentive Units”) of CarOffer and unvested Class CO CarOffer units (the "Subject Units”) remained outstanding and will vest over the requisite service periods as discussed below.

Grants of the CO Incentive Units are subject to the CarOffer 2020 Equity Incentive Plan, adopted effective November 24, 2020 (the “2020 CO Plan”), the applicable award agreement, and the 2021 CarOffer Operating Agreement. Following the 2021 CarOffer Transaction, remaining unvested CO Incentive Units will vest over a period of three years, with one-third having vested on each of January 14, 2022, and January 14, 2023, and one-third vesting on January 14, 2024, provided that a grantee’s continuous service to CarOffer has not terminated on the applicable vesting date. As a result of the 2023 CarOffer Transaction, the vesting on January 14, 2024 was accelerated and the CO Incentive Units were accelerated and redeemed. Under the terms of the grants, vesting of unvested CO Incentive Units is accelerated in the event of (i) a change of control of CarOffer (which, for the avoidance of doubt, does not include the 2021 CarOffer Transaction), (ii) the death or disability of the grantee, (iii) termination of the grantee’s employment with CarOffer without cause, or (iv) termination of grantee’s employment by the grantee for good reason. Upon termination of a grantee’s continuous service to CarOffer voluntarily by the grantee (other than for good reason) or by CarOffer for cause, all of such grantee’s unvested CO Incentive Units are forfeited. In addition, if a grantee’s continuous service terminates, then CarOffer has the option to repurchase any outstanding CO Incentive Units from the grantee.

In addition to the 2020 CO Plan, on December 9, 2020, CarOffer entered into a Vesting Agreement (the “Vesting Agreement”) regarding the vesting of Subject Units beneficially owned by Bruce Thompson, the founder and CEO of CarOffer, and certain affiliated persons (collectively, the “T5 Holders”) in connection with the Company’s then-anticipated acquisition of a 51% interest in CarOffer. Pursuant to the Vesting Agreement, 432,592 Subject Units beneficially owned by the T5 Holders vest in three approximately equal installments, with one-third having vested on each of January 14, 2022, and January 14, 2023, and one third vesting on January 14, 2024, subject to the terms of the Vesting Agreement. As a result of the 2023 CarOffer Transaction, the vesting on January 14, 2024 was accelerated and the Subject Units were accelerated and redeemed. As more particularly described in the Vesting Agreement, unvested Subject Units are subject to forfeiture in the event that Mr. Thompson’s relationship with CarOffer terminates other than in the event of a termination without cause (as defined in the Vesting Agreement) or due to Mr. Thompson’s death or disability. The Vesting Agreement also provides for acceleration of any unvested Subject Units in the event of the termination of Mr. Thompson’s employment with CarOffer without cause, Mr. Thompson’s death or disability, or the consummation of an eligible liquidity event (as defined in the Vesting Agreement).

In connection with the 2021 Closing, CarOffer reserved 228,571 incentive units (the "2021 Incentive Units") for purposes of establishing an employee incentive equity plan. Thereafter, CarOffer formed CarOffer Incentive Equity, LLC (“CIE”), a Delaware manager-managed limited liability company managed by the Company, and established the CIE 2021 Equity Incentive Plan (the “2021 CO Plan"). The 2021 CO Plan and related documentation, including the applicable award agreement, a vesting agreement between CarOffer and CIE, and the 2021 CarOffer Operating Agreement, provide for an incentive equity grant structure whereby 2021 Incentive Units will be granted to CIE and 2021 CO Plan grantees will receive an associated equity interest in CIE (the “CIE Interest”), with back-to-back vesting between the 2021 Incentive Units and the associated CIE Interest. Subject to any modifications as may be approved by the CarOffer Board of Managers in its discretion, grants under the 2021 CO Plan will vest over a period of three years from the grant date, one-third each on the first, second, and third anniversaries of the applicable grant date, provided that a grantee’s continuous service to CarOffer has not terminated on the applicable grant date. Upon termination of a grantee’s continuous service to CarOffer, all of such grantee’s unvested 2021 Incentive Units are forfeited. As of December 31, 2022 and 2021, there had not been any grants of 2021 Incentive Units under the 2021 CO Plan.

CO Incentive Units, Subject Units, and 2021 Incentive Units were liability-classified awards because the awards could be put to the Company at a formula price such that the holders do not bear the risks and rewards associated with equity ownership. For liability-classified awards, the fair value was determined on the date of issuance using a Least Square Monte Carlo simulation model. Liability-classified awards were remeasured to fair value each period until settlement. Until March 31, 2022, the Least Square Monte Carlo simulation model was used for remeasurement. During the three months ended June 30, 2022, the Company refined its model for determining the fair value of liability-classified awards as a result of obtaining gross profit actuals through the trailing twelve-months ended June 30, 2022, measurement period for the first call option. Since March 31, 2022, the fair value has typically been determined using a Monte Carlo simulation model. During the year ended December 31, 2022, the Company determined not to exercise the 2022 Call Right. The valuation of these liability-classified awards was previously derived from the 2024 Call Right and the 2024 Put Right. The determination of the fair value was affected by CarOffer’s equity value, EBITDA, and Excess Parent Capital (as defined in the 2021 CarOffer Operating Agreement) that drove the exercise price of future call/put rights, as well as a number of assumptions including market price of risk, volatility, correlation, and risk-free interest rate. As a result of the EBITDA and Excess Parent Capital projections for CarOffer as of December 31, 2022, a Monte Carlo simulation model was not required as of December 31, 2022. As a result of the 2023 CarOffer Transaction, the liability-classified awards were accelerated and redeemed as of December 31, 2023.

The Company issues shares of Class A common stock upon the vesting of RSUs and the exercise of stock options out of its shares available for issuance. During the year ended December 31, 2023, prior to the redemption of all awards in connection with the 2023 CarOffer Transaction, the Company would issue CO Incentive Units and Subject Units out of CarOffer’s units available for issuance. The Company accounts for forfeitures when they occur.

The Company recognizes compensation expense on a straight-line basis over the requisite service period.

The tax effect of differences between tax deductions related to stock compensation and the corresponding financial statement expense compensation are recognized as an income tax benefit or expense within the provision for income taxes in the consolidated income statements. The permanent differences, including excess tax benefits and expenses, are recognized within accrued expenses, accrued income taxes, and other current liabilities in the consolidated balance sheets and classified as an operating activity in the consolidated statements of cash flows. The temporary differences are recognized within deferred tax assets in the consolidated balance sheets.

For the years ended December 31, 2023, 2022, and 2021, the income tax expense related to stock-based compensation was $5,500, $4,181, and $1,179, respectively.

As of December 31, 2023, 2022, and 2021, the income tax benefit from stock-based compensation expense, recognized through the Company's deferred tax asset in the consolidated balance sheets, was $5,353, $5,441, and $5,301, respectively.

See Note 11 of these consolidated financial statements for a summary of the stock option, RSU and CO Incentive Unit activity for the year ended December 31, 2023.

Common Stock Share Repurchases

Repurchases of the Company's common stock are recognized as a reduction to common stock at par value and the remainder is recognized as a reduction to additional paid-in capital in the consolidated balance sheets. Repurchases in excess of the par value are recognized as a reduction to retained earnings in the consolidated balance sheets in the event that additional paid-in capital is reduced to zero.

If there is a difference between the trade date and the settlement date for shares repurchased as of period end, a liability is recognized within accrued expenses, accrued income taxes and other current liabilities in the consolidated balance sheets.

As a result of the IRA, effective on January 1, 2023, the Company is required to pay a 1% excise tax on certain stock repurchases. Based on the Company’s evaluation, the Company has concluded that the IRA has not had a material impact on its income tax provision and cash taxes. The excise tax is considered a direct and incremental cost of the share repurchase and will be recognized as a reduction to additional paid-in capital in the consolidated balance sheets. Other direct and incremental costs, such as commissions and legal expenses, are recognized as a reduction to additional paid-in capital in the consolidated balance sheets.

Advertising Costs

Advertising costs are expensed as incurred and recognized within sales and marketing expense in the consolidated income statements. For the years ended December 31, 2023, 2022, and 2021, advertising expense was $138,782, $156,128, and $151,457, respectively.

Comprehensive Income

Comprehensive income is defined as the change in stockholders’ equity of a business enterprise during a period from transactions and other events and circumstances from non‑owner sources. Comprehensive income consists of consolidated net income and other comprehensive income (loss), which includes certain changes in equity that are excluded from consolidated net income. Specifically, cumulative foreign currency translation adjustments are included in accumulated other comprehensive (loss) income. As of December 31, 2023 and 2022, accumulated other comprehensive (loss) income is presented separately in the consolidated balance sheets and consists entirely of cumulative foreign currency translation adjustments.

Recent Accounting Pronouncements Not Yet Adopted

From time to time, new accounting pronouncements are issued by the FASB or other standard-setting bodies and adopted by the Company on or prior to the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption. As of December 31, 2023, there are no new accounting pronouncements that the Company is considering adopting, other than those described below.

In December 2023 the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures ("ASU 2023-09"). ASU 2023-09 is intended to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 addresses investor requests for enhanced income tax information primarily through changes to the rate reconciliation and income taxes paid information. Early adoption is permitted. A public entity should apply ASU 2023-09 prospectively to all annual periods beginning after December 15, 2024. The Company is currently evaluating the impact of ASU 2023-09 on its future consolidated financial statements and related disclosures.

In November 2023 the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ("ASU 2023-07"). ASU 2023-07 is intended to enhance disclosures for significant segment expenses for all public entities required to report segment information in accordance with ASC Topic 280, Segment Reporting ("ASC 280"). ASC 280 requires a public entity to report for each reportable segment a measure of segment profit or loss that its chief operating decision maker (“CODM”) uses to assess segment performance and to make decisions about resource allocations. ASU 2023-07 is intended to improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more useful financial analyses. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. A public entity should apply ASU 2023-07 retrospectively to all prior periods presented in the consolidated financial statements. The Company is currently evaluating the impact of ASU 2023-07 on its future consolidated financial statements and related disclosures.

In October 2023 the FASB issued ASU 2023-06, Disclosure Improvements – Codification Amendments in Response to the SEC's Disclosure Update and Simplification Initiative ("ASU 2023-06"). ASU 2023-06 modifies the disclosure and presentation requirements for a variety of topics in the FASB ASC. The Company is currently evaluating the impact of ASU 2023-06 on its future consolidated financial statements and related disclosures.

Goodwill and Other Intangible Assets

Earnings Per Share

The Company has two classes of common stock authorized: Class A common stock and Class B common stock. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time or automatically upon certain events described in the Company’s amended and restated certificate of incorporation, including upon either the death or voluntary termination of the Company’s Executive Chair. The Company allocates undistributed earnings attributable to common stock between the common stock classes on a one‑to‑one basis when computing net income (loss) per share. As a result, basic and diluted net income (loss) per share of Class A common stock and per share of Class B common stock are equivalent.

Stock-based Compensation - Summary of Allocation of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	$ 113,456	$ 33,682	$ 77,710
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	2,370	475	417
Sales and Marketing Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	13,710	7,733	12,801
Product, Technology, and Development Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	25,934	20,266	22,289
General and Administrative Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	$ 71,442	$ 5,208	$ 42,203

Earnings Per Share

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Earnings Per Share

12. Earnings Per Share

During the years ended December 31, 2023 and 2022, no shares of Class B common stock were converted into Class A common stock. During the year ended 2021, holders of Class B common stock converted 3,077,327 shares of Class B common stock to Class A common stock.

Basic net income (loss) per share (“Basic EPS”) is computed by dividing consolidated net income adjusted for net loss attributable to redeemable noncontrolling interest and changes in the redemption value of redeemable noncontrolling interest, if applicable, by the weighted-average number of common shares outstanding during the reporting period. The Company computes the weighted-average number of common shares outstanding during the reporting period using the total number of shares of Class A common stock and Class B common stock outstanding as of the last day of the previous year plus the weighted-average of any additional shares issued and outstanding during the reporting period, less the weighted-average of any shares repurchased during the period.

Diluted net income (loss) per share (“Diluted EPS”) gives effect to all potentially dilutive securities. Diluted EPS is computed by dividing consolidated net income adjusted for net loss attributable to redeemable noncontrolling interest and changes in the redemption value of redeemable noncontrolling interest, if applicable and dilutive, by the weighted-average number of common shares outstanding during the reporting period using (i) the number of shares of common stock used in the Basic EPS calculation as indicated above, (ii) if dilutive, the incremental weighted-average common stock that the Company would issue upon the exercise of stock options and the vesting of RSUs, and (iii) if dilutive, market-based performance awards based on the number of shares that would be issuable as of the end of the reporting period assuming the end of the reporting period was also the end of the contingency period. The dilutive effect of these common stock equivalents is reflected in diluted earnings per share by application of the treasury stock method. For previous periods, the if-converted method was used to calculate the number of shares issuable upon exercise of the 2024 Put Right, inclusive of CarOffer noncontrolling interest and CO Incentive and Subject Units, that would have been issuable as of the end of the reporting period assuming the end of the reporting period was also the end of the contingency period.

For the years ended December 31, 2023, 2022, and 2021, a reconciliation of the numerator and denominator used in the calculation of basic and diluted net income (loss) per share is as follows:


	Year Ended December 31,
	2023			2022			2021
Numerator:
Consolidated net income	$	22,053		$	78,954		$	110,373
Net loss attributable to redeemable noncontrolling interest		(14,889	)		(5,433	)		1,129
Deemed dividend on redemption of noncontrolling interest		5,838			—			—
Accretion of redeemable noncontrolling interest to redemption value		—			(109,398	)		109,398
Net income (loss) attributable to common stockholders — basic	$	31,104		$	193,785		$	(154	)
Net loss attributable to redeemable noncontrolling interest		(14,889	)		(5,433	)		—
Deemed dividend on redemption of noncontrolling interest		5,838			—			—
Accretion of redeemable noncontrolling interest to redemption value		—			(109,398	)		—
Net income (loss) attributable to common stockholders — diluted	$	22,053		$	78,954		$	(154	)
Denominator:
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders — basic		113,240,139			118,474,991			117,142,062
Dilutive effect of share equivalents resulting from stock options		225,691			275,330			—
Dilutive effect of share equivalents resulting from unvested restricted stock units		723,004			366,258			—
Dilutive effect of share equivalents resulting from CO Incentive units, Subject Units, and noncontrolling interest		—			9,034,395			—
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders — diluted		114,188,834			128,150,974			117,142,062
Net income (loss) per share attributable to common stockholders:
Basic	$	0.27		$	1.64		$	(0.00	)
Diluted	$	0.19		$	0.62		$	(0.00	)


	Year Ended December 31,
	2023		2022		2021
Stock options outstanding		551,196		587,494		617,504
Restricted stock units outstanding		2,333,489		2,634,463		2,867,330
CO Incentive Units, Subject Units and noncontrolling interest		—		—		1,509,750

For the year ended December 31, 2021, shares of Class A common stock potentially issuable under market-based performance awards of approximately 14,682 RSUs were excluded from the calculation of weighted average shares used to compute Diluted EPS as the market-based vesting conditions had not been achieved as of the reporting period end date and as such there were zero contingently issuable shares. As a result of the 2023 CarOffer Transaction, there were no contingently issuable shares as of December 31, 2023. For the year ended December 31, 2022, there was no effect of potentially dilutive shares as the numerator was negative. Additionally, during the year ended December 31, 2022, the Company modified its market-based performance awards to contain only service-based vesting conditions in line with the Company's other RSU awards. As a result, there are no market-based RSUs outstanding as of December 31, 2023 or 2022.

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Effective tax rate attributable to CarGurus, Inc	44.50%	27.70%	26.30%
Change in valuation allowance	$ 47	$ 29
Deferred tax assets, federal net operating loss carryforwards	277
Deferred tax assets, state net operating loss carryforwards	$ 3,442
Percentage of annual limitation of taxable income	80.00%
Statutory tax rate	21.00%	21.00%	21.00%
Liabilities for uncertain tax positions	$ 812	$ 598	$ 0
Federal
Income Tax Disclosure [Line Items]
Tax credit carryforwards	$ 673
State
Income Tax Disclosure [Line Items]
Operating loss carryforwards expiration year	2040
Tax credit carryforwards	$ 322
Internal Revenue Service (IRS)
Income Tax Disclosure [Line Items]
Tax credit carryforward limitations on use, cumulative ownership change, period	3 years
Tax credit carryforward, limitations on use	an ownership change, as defined by Section 382, results from transactions that increase the ownership of 5% stockholders in the stock of a corporation by more than 50% in the aggregate over a three-year period.
Open tax year	2019
Internal Revenue Service (IRS) \| Maximum
Income Tax Disclosure [Line Items]
Tax credit carryforward limitations on use, cumulative ownership change percentage	50.00%
Revenue Commissioners, Ireland \| Foreign
Income Tax Disclosure [Line Items]
Open tax year	2017

Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

5. Fair Value of Financial Instruments

As of December 31, 2023 and 2022, assets measured at fair value on a recurring basis consist of the following:


	As of December 31, 2023
	Quoted Prices in Active Markets for Identical Assets (Level 1 Inputs)		Significant Other Observable Inputs (Level 2 Inputs)		Significant Unobservable Inputs (Level 3 Inputs)		Total
Cash equivalents:
Mutual Funds	$	73,449	$	—	$	—	$	73,449
Short-term investments:
Mutual Funds		20,724		—		—		20,724
Total	$	94,173	$	—	$	—	$	94,173


	As of December 31, 2022
	Quoted Prices in Active Markets for Identical Assets (Level 1 Inputs)		Significant Other Observable Inputs (Level 2 Inputs)		Significant Unobservable Inputs (Level 3 Inputs)		Total
Cash equivalents:
Mutual funds	$	175,486	$	—	$	—	$	175,486
Total	$	175,486	$	—	$	—	$	175,486

As of December 31, 2023, the Company received $3,075 in dividend income from the investments, recognized within interest income on the consolidated income statements. As of December 31, 2023, unrealized gain on short-term investments in equity securities was immaterial.

As of December 31, 2022, the Company did not hold any investments.

Summary of Significant Accounting Policies - Additional Information 1 (Details)					12 Months Ended
	Nov. 30, 2023 shares	Jan. 01, 2023	Jan. 14, 2021 USD ($) $ / shares shares	Dec. 09, 2020 shares	Dec. 31, 2023 USD ($) Days $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2024 USD ($)	Sep. 26, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Payment of revenue, performance obligation, description of payment terms					30 to 60 days
Costs to obtain a contract					$ 24,093,000	$ 17,394,000
Amortization of deferred contract costs					11,817,000	11,067,000	$ 12,653,000
Guarantee income					1,890,000	10,026,000	5,537,000
Maximum potential amount of future payments required to make under guarantees					10,158,000	31,056,000	76,075,000
Tax expense related to stock-based compensation					5,500,000	4,181,000	1,179,000
Income tax benefit from stock-based compensation expense					5,353,000	5,441,000	5,301,000
Advertising expense					138,782,000	156,128,000	151,457,000
Deferred financing costs					1,927,000	2,442,000	0
Amortization of deferred financing costs					515,000	136,000	0
Exercise of guarantee net loss					417,000	4,568,000
Business acquisition, stock consideration							$ 103,645,000
Stock repurchases excise tax percentage		1.00%
Revolving Credit Facility
Summary Of Significant Accounting Policies [Line Items]
Letter of credit facility					0	0
Line of credit facility maximum borrowing amount					390,373,000				$ 400,000,000
Deferred financing costs					1,927,000	2,442,000
Amortization of deferred financing costs					515,000	136,000
Revolving Credit Facility \| Letter of Credit Facility
Summary Of Significant Accounting Policies [Line Items]
Letter of credit facility					$ 9,627,000	$ 0			$ 50,000,000
Restricted Stock Units
Summary Of Significant Accounting Policies [Line Items]
Other than option outstanding \| shares					5,687,711	4,484,291
Employee Stock Option
Summary Of Significant Accounting Policies [Line Items]
Options granted during period \| shares					0	30,266	619,618
Requisite service period					4 years
Vesting period					10 years
Market-based RSU
Summary Of Significant Accounting Policies [Line Items]
Other than option outstanding \| shares					0
CarOffer
Summary Of Significant Accounting Policies [Line Items]
Business acquisition, percentage of equity interest acquired			51.00%				51.00%
Number of days guarantee period \| Days					45
Maximum potential amount of future payments required to make under guarantees					$ 10,158,000	$ 31,056,000	$ 76,075,000
Contingent loss liabilities					$ 0	$ 0	$ 0
Business acquisition date			Jan. 14, 2021
Business acquisition, aggregate consideration			$ 173,155,000
Aggregate consideration amount			69,510,000
Retention pool aggregate amount			8,000,000
Retention pool amount granted to employees			6,000,000
Retention pool amount available for issuance to future employees			2,000,000
CarOffer \| 2022 Call Right
Summary Of Significant Accounting Policies [Line Items]
Business acquisition, option to acquire remaining percentage of interest						25.00%
CarOffer \| Scenario Forecast \| 2022 Call Right
Summary Of Significant Accounting Policies [Line Items]
Business acquisition, option to acquire remaining value of interest								$ 100,000,000
CarOffer \| Restricted Stock Units
Summary Of Significant Accounting Policies [Line Items]
Requisite service period					4 years
Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock, par value \| $ / shares					$ 0.001	$ 0.001
Class A Common Stock \| CarOffer
Summary Of Significant Accounting Policies [Line Items]
Business acquisition, stock consideration			$ 103,645,000
Business acquisition, stock consideration shares issued \| shares			3,115,282
Business acquisition, share price \| $ / shares			$ 22.51
2020 CO Plan
Summary Of Significant Accounting Policies [Line Items]
Vesting description	with one-third having vested on each of January 14, 2022, and January 14, 2023, and one-third vesting on January 14, 2024, provided that a grantee’s continuous service to CarOffer has not terminated on the applicable vesting date.
Vesting Agreement \| CarOffer
Summary Of Significant Accounting Policies [Line Items]
Business acquisition, percentage of equity interest acquired				51.00%
Vesting number of shares \| shares				432,592
Vesting description					with one-third having vested on each of January 14, 2022, and January 14, 2023, and one third vesting on January 14, 2024, subject to the terms of the Vesting Agreement.
2021 CO Plan
Summary Of Significant Accounting Policies [Line Items]
Number of shares authorized for issuances \| shares	228,571

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 22,053	$ 78,954	$ 110,373
Other comprehensive income:
Foreign currency translation adjustment	743	(1,241)	(2,283)
Consolidated comprehensive income	22,796	77,713	108,090
Comprehensive (loss) income attributable to redeemable noncontrolling interests	(14,889)	(5,433)	1,129
Comprehensive income attributable to CarGurus, Inc.	$ 37,685	$ 83,146	$ 106,961

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-28

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480175/815-40-65-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-8

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-9

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480167/946-830-55-11

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 205
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480767/946-205-45-3

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+ Details

Consolidated Income Statements (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Depreciation and amortization expense	$ 32,643	$ 29,852	$ 26,061

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)		12 Months Ended
	Oct. 01, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 0	$ 0	$ 0
Amortization of intangible assets		$ 30,062,000	$ 30,716,000	$ 30,152,000
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]				Impairment of Long-Lived Assets to be Disposed of
Wrote off intangible assets				$ 647,000

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Allowance for doubtful accounts	$ 610	$ 1,809
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	92,175,243	101,636,649
Common stock, shares outstanding	92,175,243	101,636,649
Class B Common Stock
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	15,999,173	15,999,173
Common stock, shares outstanding	15,999,173	15,999,173

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Subsequent Event Considerations

Use of Estimates

Concentration of Credit Risk

For the years ended December 31, 2023, 2022, and 2021, no individual customer accounted for more than 10% of total revenue.

Significant Accounting Policies

The consolidated financial statements reflect the application of certain significant accounting policies as described below and elsewhere in the notes of these consolidated financial statements.

Cash, Cash Equivalents, and Investments

Cash equivalents are carried at cost, which approximates their fair market value.

Purchases of equity securities and debt securities are recognized within investing activities in the consolidated statements of cash flows.

As of December 31, 2023, the Company held short-term investments in equity securities.

As of December 31, 2022, the Company held no investments.

Restricted Cash

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable is recorded based on the amount due from the customer and a third-party transaction processor. Accounts receivable do not bear interest.

As of December 31, 2023 and 2022, changes in the Company’s allowance for doubtful accounts are as follows:


	Balance at Beginning of Period		Provision		Write–offs, net of recoveries			Balance at End of Period
Year ended December 31, 2023	$	1,809	$	378	$	(1,577	)	$	610
Year ended December 31, 2022		420		1,769		(380	)		1,809

Inventory

Property and Equipment


		Estimated Useful Life (In Years)
Server and computer equipment		3
Capitalized internal-use software		3
Capitalized website development		3
Furniture and fixtures		3 to 5
Right-of-use assets		Lease term, or asset life if shorter
Leasehold improvements		Lease term, or asset life if shorter

Expenditures for repairs and maintenance are charged to expense as incurred, whereas major betterments are capitalized as additions to property and equipment.

Impairment of Long‑Lived Assets

Capitalized Website Development and Capitalized Internal-Use Software Costs

Capitalized Hosting Arrangements

Business Combinations

Valuation of Acquired Assets and Liabilities

Intangible Assets

Goodwill

Redeemable Noncontrolling Interest

See Note 4 of these consolidated financial statements for further information regarding the 2023 CarOffer Transaction.

Leases

Contingent Liabilities

Income Taxes

For the year ended December 31, 2023, income tax expense and liability related to uncertain tax positions, exclusive of immaterial interest or penalties related to uncertain tax provisions was $812, which would favorably affect the Company's effective tax rate, if recognized. For the year ended December 31, 2022, income tax expense and liability related to uncertain tax positions, exclusive of immaterial interest or penalties related to uncertain tax provisions was $598.

The Company will continue to monitor the changes in tax laws and regulations to evaluate their potential impact on its business.

Fair Value of Financial Instruments

Level 1 — Quoted unadjusted prices for identical instruments in active markets.

Level 3 — Model‑derived valuations in which one or more significant inputs or significant value drivers are unobservable, including assumptions developed by the Company.

Debt

As of December 31, 2023, commitment fees under the 2022 Revolver were immaterial.

Deferred Financing Costs

Foreign Currency Translation

Revenue Recognition

Sources of Revenue

Revenue Recognition

1) Identify the contract with a customer

2) Identify the performance obligations in the contract

3) Determine the transaction price

4) Allocate the transaction price to performance obligations in the contract

5) Recognize revenue when or as the Company satisfies a performance obligation

Marketplace Revenue - Description

The Company offers paid Listings packages for the Autolist and PistonHeads websites.

The Company also offers dealer advertising products for the PistonHeads website.

The Company also offers non-dealer advertising products for the Autolist and PistonHeads websites.

Marketplace Revenue - Revenue Recognition

Wholesale Revenue - Description

Wholesale Revenue - Revenue Recognition

Wholesale revenue is presented net of any taxes collected from customers.

Typically, customers are billed upon successful matching of a buyer and seller, with payment due upon receipt.

Product Revenue - Description

Product - Revenue Recognition

Product revenue presented net of any taxes collected from customers.

Typically, customers are billed upon successful matching of a buyer and seller, with payment due upon receipt.

Contracts with Multiple Performance Obligations

Costs to Obtain a Contract

Deferred Revenue

Marketplace Cost of Revenue

Wholesale Cost of Revenue

Product Cost of Revenue

Guarantees and Indemnification Obligations

The Company provides certain guarantees to dealers through products such as its 45-Day Guarantee and OfferGuard service offerings on the CarOffer platform, which are accounted for under ASC 460.

Stock‑Based Compensation

For stock‑based awards granted under the Company’s stock‑based compensation plans, the fair value of each award is determined on the date of grant.

There were no options granted during the year ended December 31, 2023.

The weighted average assumptions utilized to determine the fair value of options granted during the year ended December 31, 2022 and 2021, are as follows:


	Year Ended December 31,			Year Ended December 31,
	2022			2021
Expected dividend yield		—			—
Expected volatility		48.03	%		50.95	%
Risk–free interest rate		1.47	%		0.69	%
Expected term (in years)	6.11				6.06

The foregoing summary of the 2021 Purchase Agreement, the 2021 CarOffer Operating Agreement, and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the 2021 Purchase Agreement and the 2021 CarOffer Operating Agreement, which are included as Exhibit 2.1 to the Annual Report on Form 10-K for the year ended December 31, 2020, filed on February 21, 2021, and Exhibit 10.27 to the Annual Report on Form 10-K for the year ended December 31, 2021, filed on February 25, 2022, respectively.

The Company recognizes compensation expense on a straight-line basis over the requisite service period.

For the years ended December 31, 2023, 2022, and 2021, the income tax expense related to stock-based compensation was $5,500, $4,181, and $1,179, respectively.

See Note 11 of these consolidated financial statements for a summary of the stock option, RSU and CO Incentive Unit activity for the year ended December 31, 2023.

Common Stock Share Repurchases

Advertising Costs

Comprehensive Income

Recent Accounting Pronouncements Not Yet Adopted

Commitments and Contingencies

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

10. Commitments and Contingencies

Contractual Obligations and Commitments

As of December 31, 2023, all of the Company’s property, equipment, and externally sourced internal-use software have been purchased with cash with the exception of amounts related to unpaid property and equipment, capitalized website development, capitalized internal-use software, capitalized hosting arrangements, and amounts related to obligations under finance leases as disclosed in the consolidated statements of cash flows. In connection with the 1001 Boylston Street Lease (as defined below), the Company expects to spend approximately $69,815, net of tenant reimbursements. As of December 31, 2023, the Company has incurred $40,561 in expenses, of which $2,891 was reimbursed as part of the tenant improvement allowance for the 1001 Boylston Street Lease. Of the total incurred expenses, $40,325 was capitalized, consisting of $39,835 in capitalized incurred expenses recognized in property and equipment, net and $490 in capitalized incurred expenses recognized in prepaid expenses, prepaid income taxes and other current assets on the consolidated balance sheets. As of December 31, 2023, the Company has also signed $46,473 in gross contract commitments, which have not yet been incurred. The Company has no other material long-term purchase obligations outstanding with any vendors or third-parties.

Leases

The Company’s material lease obligations consist of various leases for office space in: Boston, Massachusetts; Cambridge, Massachusetts; San Francisco, California; Addison, Texas; and Dublin, Ireland.

The Company has non-cancellable lease terms through 2033 for its various commenced operating leases, certain of which include the option to extend the lease term up to two additional periods of five years. Additionally, certain leases provide for annual rent increases through the terms of the leases, leasehold improvement incentives, and variable payments related to operating expenses, taxes, utilities, insurance, and maintenance expenses. Certain leases also contain non-lease components in the contract. Non-lease components relate to operating expenses, parking, utilities, and maintenance expenses.

The Company has non-cancellable lease terms through 2025 for its various operating subleases, for which the Company acts as the lessor, certain of which include the option to extend the sublease term up to one additional period of three years. Additionally, certain subleases provide for annual rent increases through the terms of the leases and variable payments related to operating expenses, taxes, parking, and utilities. Certain subleases also contain both lease and non-lease components in the contract. Non-lease components relate to operating expenses, parking, utilities, and maintenance expenses.

As of December 31, 2023, there were no material changes in the Company's leases from those disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022, other than those described below.

New Material Leases

On November 14, 2023, the Company amended its operating lease agreement in Addison, Texas, at 15601 Dallas Parkway, which was originally entered into on April 28, 2022, for the lease of 30,913 square feet of office space. The amendment relocates the existing premises from Suite 800 to Suite 900, also consisting of 30,913 square feet of office space. The lease term and payments do not change from the original agreement. The lease, as amended, provides for (i) an extension of the reimbursement deadline of the tenant improvement allowance to May 31, 2024, and (ii) an additional security deposit in the form of a restricted letter of credit, recognized in other non-current assets in the consolidated balance sheets. Since the lease amendment relocates leased space with the same landlord, the Company accounted for the amendment as a termination of the existing lease, with the difference between the right-of-use ("ROU") asset and lease liability of the existing lease included as part of the ROU asset of the new lease.

The Company’s operating lease agreement in Boston, Massachusetts, for 225,428 square feet at 1001 Boylston Street (the "1001 Boylston Street Lease") commenced on February 3, 2023 ("Delivery Date"), as the Company has been granted access to begin its build out. The “Commencement Date” of the lease term is the earlier to occur of (i) the date that is 12 months following the Delivery Date and (ii) the date that the Company first occupies the premises for the normal conduct of business for the Permitted Use (as defined in the 1001 Boylston Street Lease). The initial term will commence on the Commencement Date and expire on the date that is 180 full calendar months after the Commencement Date (plus the partial month, if any, immediately following the Commencement Date). The 1001 Boylston Street Lease provides for the option to terminate early under certain circumstances and contains options to extend the lease term for two additional periods of five years. The 1001 Boylston Street Lease provides for annual rent increases through the term of the lease, leasehold improvement incentives, and variable payments related to operating expenses, management fees, taxes, utilities, insurance, and maintenance expenses. The 1001 Boylston Street Lease also contains both lease and non-lease components. Non-lease components relate to operating expenses, parking, utilities, and maintenance expenses. The Company expects to move into the office space in 2024.

The Company’s financing lease obligations, which consist of a lease for furniture and office equipment, are immaterial.

For the years ended December 31, 2023, 2022, and 2021, the Company recognized $34,218, $16,732, and $15,844, respectively, of lease costs.

For the year ended December 31, 2023, the Company recognized $1,897 of sublease income. For the year ended December 31, 2022, the Company recognized $1,809 of sublease income. There was no sublease income for the year ended December 31, 2021.

As of December 31, 2023 and 2022, the weighted average remaining lease term was 13.1 years and 7.1 years, respectively, and the weighted average discount rate was 5.7% and 4.9%, respectively. As the Company’s leases do not provide an implicit rate, the Company uses an estimated incremental borrowing rate based on the information available at lease commencement in determining the present value of lease payments. The Company estimated the incremental borrowing rate based on the rate of interest the Company would have to pay to borrow a similar amount on a collateralized basis over a similar term. The Company has no historical debt transactions and a collateralized rate is estimated based on a group of peer companies. The Company used the incremental borrowing rate on January 1, 2019, for leases that commenced prior to that date.

Lease Commitments

As of December 31, 2023, future minimum lease payments for all leases are as follows:


Year Ending December 31,	Operating Lease Commitments
2024	$	3,150
2025		18,881
2026		22,332
2027		22,740
2028		23,160
Thereafter		208,079
Total lease payments		298,342
Less imputed interest		(103,952	)
Total	$	194,390

The table above does not include options to extend lease terms that are not reasonably certain of being exercised or leases signed but not yet commenced as of December 31, 2023. As of December 31, 2023, there were no leases signed but not commenced.

As of December 31, 2023, future minimum sublease income payments are as follows:


Year Ending December 31,	Sublease Income Payments
2024	$	2,318
2025		1,418
2026		—
2027		—
2028		—
Thereafter		—
Total	$	3,736

Restricted Cash

As of December 31, 2023, $9,627 in letters of credit associated with the Company's leases were included under the 2022 Revolver Sub-facility. During the year ended December 31, 2023, the Company canceled three letters of credit associated with the 1001 Boylston, the San Francisco, and the Cambridge (55 Cambridge Parkway) leases and reissued these letters of credit under the 2022 Revolver Sub-facility. As of December 31, 2022, all letters of credit were collateralized by cash, which was recognized as restricted cash in the consolidated balance sheets.

As of December 31, 2023, restricted cash was $2,563 and primarily related to pass-through payments from customers related to the Company's Digital Wholesale business. As of December 31, 2022, restricted cash was $14,615 and primarily related to cash held at a financial institution in an interest‑bearing cash account as collateral for the letters of credit related to the contractual provisions for the Company’s building leases and pass-through payments from customers related to the Company’s Digital Wholesale business.

As of December 31, 2023, all restricted cash was classified as a short-term asset, as disclosed in the consolidated balance sheets. As of December 31, 2022, portions of restricted cash were classified as a short-term asset and long‑term asset, as disclosed in the consolidated balance sheets. Of the letters of credit outstanding as of December 31, 2022, the Company canceled a letter of credit associated with the Cambridge (2 Canal Park) lease, however, the cash was recognized as restricted cash as of March 31, 2023, until it was released from the bank.

Legal Matters

From time to time, the Company may become involved in legal proceedings or be subject to claims arising in the ordinary course of its business. The Company recognizes a liability when it believes that it is both probable that a liability has been incurred and the amount of loss can be reasonably estimated. Judgment is required to determine both the probability of having incurred a liability and the estimated amount of the liability. The Company is not presently subject to any pending or threatened litigation that it believes, if determined adversely to the Company, individually, or taken together, would reasonably be expected to have a material adverse effect on its business or financial results. However, litigation is inherently unpredictable and the future outcome of legal proceedings and other contingencies may be unexpected or differ from the Company’s estimated liabilities, which could have a material adverse effect on the Company’s future financial results.

Guarantees and Indemnification Obligations

The Company provides certain guarantees to dealers through products such as its 45-Day Guarantee and OfferGuard service offerings on the CarOffer platform, which are accounted for under ASC 460.

A guarantee liability is initially measured using the amount of consideration received from the dealer for the purchase of the guarantee. The initial liability is released, and guarantee income is recognized, upon the earliest of the following: the vehicle sells during the guarantee period, the seller exercises its put option during the guarantee period, or the option expires unexercised at the end of the guarantee period. Guarantee income is recognized within wholesale revenue in the consolidated income statements. Gains and losses resulting from dealers' exercise of guarantees are recognized within wholesale cost of revenue in the consolidated income statements. When it is probable and reasonably estimable that the Company will incur a loss on a vehicle that it is required to purchase, a liability and a corresponding charge to wholesale cost of revenue is recognized for the amount of the loss in the consolidated balance sheets and the consolidated income statements, respectively. Gains and losses resulting from the dealers exercise of guarantees are recognized within wholesale cost of revenue, as appropriate, in the consolidated income statements.

For the years ended December 31, 2023 and 2022 income for guarantees purchased by dealers was $1,890 and $10,026, respectively. For the year ended December 31, 2023 and 2022, the loss, net of gains, recognized within cost of revenue in the consolidated income statements resulting from dealers' exercise of guarantees was $417 and $4,568, respectively.

As of December 31, 2023, the maximum potential amount of future payments that the Company could be required to make under these guarantees was $10,158. Of the maximum potential amount of future payments, the losses that were probable were not material. As such, as of December 31, 2023, the Company had no material contingent loss liabilities.

As of December 31, 2022, the maximum potential amount of future payments that the Company could be required to make under these guarantees was $31,056. Of the maximum potential amount of future payments, the losses that were probable were not material. As such, as of December 31, 2022, the Company had no material contingent loss liabilities.

Stock-based Compensation - Summary of Stock-based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	$ 113,456	$ 33,682	$ 77,710
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	2,386	2,553	2,471
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	55,527	52,224	52,916
CO Incentive Units and Subject Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	26,552	$ (21,095)	$ 22,323
Noncontrolling Interest Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	$ 28,991

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480483/718-10-35-1D

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Paragraph 3
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2023	Feb. 22, 2024	Jun. 30, 2023
Document And Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Registrant Name	CarGurus, Inc.
Trading Symbol	CARG
Entity Central Index Key	0001494259
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1,289,254,386
Entity File Number	001-38233
Title of 12(b) Security	Class A Common Stock, par value $0.001 per share
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3843478
Entity Address, Address Line One	55 Cambridge Parkway
Entity Address, Address Line Two	6th Floor
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02142
City Area Code	617
Local Phone Number	354-0068
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive Proxy Statement for its 2024 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K. Such Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Boston, Massachusetts
Document Financial Statement Error Correction [Flag]	false
Class A Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		91,439,976
Class B Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		15,999,173

Commitments and Contingencies - Schedule of Future Minimum Sublease Income Payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2024	$ 2,318
2025	1,418
Total	$ 3,736

Stock-based Compensation - Summary of Shares of Common Stock Reserved for Future Issuance (Details) - Class A Common Stock	Dec. 31, 2023 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of authorized common stock reserved for future issuance	12,700,433
Stock Options Outstanding
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of authorized common stock reserved for future issuance	776,094
Unvested restricted stock units outstanding
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of authorized common stock reserved for future issuance	5,687,711
2017 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of authorized common stock reserved for future issuance	6,236,628

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2023
Server and Computer Equipment
Property Plant And Equipment [Line Items]
Estimated Useful Life	3 years
Capitalized Internal-Use Software
Property Plant And Equipment [Line Items]
Estimated Useful Life	3 years
Capitalized Website Development
Property Plant And Equipment [Line Items]
Estimated Useful Life	3 years
Furniture and Fixtures \| Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life	3 years
Furniture and Fixtures \| Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life	5 years
Right-of-Use Assets
Property Plant And Equipment [Line Items]
Estimated Useful Life	Lease term, or asset life if shorter
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated Useful Life	Lease term, or asset life if shorter

Segment and Geographic Information - Additional Information (Details) - Segment	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023
Segment Reporting Information [Line Items]
Number of reportable segments	2	1	2

Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Schedule of Fair Value Levels, Assets Measured at Fair Value on Recurring Basis

As of December 31, 2023 and 2022, assets measured at fair value on a recurring basis consist of the following:


	As of December 31, 2023
	Quoted Prices in Active Markets for Identical Assets (Level 1 Inputs)		Significant Other Observable Inputs (Level 2 Inputs)		Significant Unobservable Inputs (Level 3 Inputs)		Total
Cash equivalents:
Mutual Funds	$	73,449	$	—	$	—	$	73,449
Short-term investments:
Mutual Funds		20,724		—		—		20,724
Total	$	94,173	$	—	$	—	$	94,173


	As of December 31, 2022
	Quoted Prices in Active Markets for Identical Assets (Level 1 Inputs)		Significant Other Observable Inputs (Level 2 Inputs)		Significant Unobservable Inputs (Level 3 Inputs)		Total
Cash equivalents:
Mutual funds	$	175,486	$	—	$	—	$	175,486
Total	$	175,486	$	—	$	—	$	175,486

As of December 31, 2023, the Company received $3,075 in dividend income from the investments, recognized within interest income on the consolidated income statements.

Organization and Business Description - Additional Information (Details) - Segment	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	2	1	2

Revenue Recognition - Summary of Revenue from Contracts with Customers by Services and Products (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 914,242	$ 1,655,035	$ 951,373
Marketplace
Disaggregation of Revenue [Line Items]
Revenue	698,236	658,771	636,942
Dealer-to-Dealer
Disaggregation of Revenue [Line Items]
Revenue	109,802	320,119	224,831
Instant Max Cash Offer
Disaggregation of Revenue [Line Items]
Revenue	$ 106,204	$ 676,145	$ 89,600

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

- Definition

+ References

+ Details

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Summary of Future Minimum Lease Payments

As of December 31, 2023, future minimum lease payments for all leases are as follows:


Year Ending December 31,	Operating Lease Commitments
2024	$	3,150
2025		18,881
2026		22,332
2027		22,740
2028		23,160
Thereafter		208,079
Total lease payments		298,342
Less imputed interest		(103,952	)
Total	$	194,390

Schedule of Future Minimum Sublease Income Payments

As of December 31, 2023, future minimum sublease income payments are as follows:


Year Ending December 31,	Sublease Income Payments
2024	$	2,318
2025		1,418
2026		—
2027		—
2028		—
Thereafter		—
Total	$	3,736

2023 CarOffer Transaction - Additional Information (Details) - USD ($)		12 Months Ended
	Jan. 14, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Acquisition, Contingent Consideration [Line Items]
Stock consideration				$ 103,645,000
Stock-based compensation expense		$ 113,456,000	$ 33,682,000	77,710,000
Redeemable noncontrolling interest		0	36,749,000	162,808,000	$ 0
Deemed dividend on redemption of noncontrolling interest		5,838,000
General and Administrative Expense
Asset Acquisition, Contingent Consideration [Line Items]
Stock-based compensation expense		71,442,000	5,208,000	$ 42,203,000
CarOffer
Asset Acquisition, Contingent Consideration [Line Items]
Business acquisition, percentage of equity interest acquired	51.00%			51.00%
Business acquisition, aggregate consideration	$ 173,155,000
Cash consideration	69,510,000
Retention pool aggregate amount	8,000,000
Retention pool amount granted to employees	6,000,000
Retention pool amount available for issuance to future employees	$ 2,000,000
CarOffer \| 2021 Purchase Agreement
Asset Acquisition, Contingent Consideration [Line Items]
Business acquisition, percentage of equity interest acquired	51.00%
Business acquisition, aggregate consideration	$ 173,155,000
Cash consideration	69,510,000
Retention pool aggregate amount	8,000,000
Retention pool amount granted to employees	6,000,000
Retention pool amount available for issuance to future employees	2,000,000
Acquisition-related costs incurred		0	$ 0	$ 2,647,000
CarOffer \| 2023 Purchase Agreement
Asset Acquisition, Contingent Consideration [Line Items]
Cash consideration		75,000
Acquisition-related costs incurred		1,044,000
Stock-based compensation expense		50,000,000
Gain on business transaction		$ 0
CarOffer \| General and Administrative Expense \| 2021 Purchase Agreement
Asset Acquisition, Contingent Consideration [Line Items]
Acquisition-related costs incurred				$ 709,000
CarOffer \| Class A Common Stock
Asset Acquisition, Contingent Consideration [Line Items]
Stock consideration	$ 103,645,000
Business acquisition, stock consideration shares issued	3,115,282
Business acquisition, share price	$ 22.51
CarOffer \| Class A Common Stock \| 2021 Purchase Agreement
Asset Acquisition, Contingent Consideration [Line Items]
Stock consideration	$ 103,645,000
Business acquisition, stock consideration shares issued	3,115,282
Business acquisition, share price	$ 22.51

Debt - Additional Information (Details) - USD ($)		12 Months Ended
Debt - Additional Information (Details) - USD ($)	Sep. 26, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt outstanding		$ 0	$ 0
Line of credit facility maturity date			Sep. 26, 2027
Deferred financing costs		1,927,000	$ 2,442,000	$ 0
Amortization of deferred financing costs		515,000	136,000	$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing amount	$ 400,000,000	390,373,000
Letter of credit facility		0	0
Line of credit facility increased in maximum borrowing capacity	$ 250,000,000
Increase in borrowing capacity equal to percentage of four quarter EBDITA	100.00%
Deferred financing costs		1,927,000	2,442,000
Amortization of deferred financing costs		515,000	136,000
Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility unutilized commitment fee percentage	0.125%
Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility unutilized commitment fee percentage	0.175%
Letter of Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Letter of credit facility	$ 50,000,000	$ 9,627,000	$ 0

Property and Equipment, Net

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

6. Property and Equipment, Net

As of December 31, 2023 and 2022, property and equipment, net consist of the following:


	As of December 31,
	2023			2022
Capitalized equipment	$	1,326		$	7,877
Capitalized internal-use software		12,279			7,429
Capitalized website development		57,158			36,369
Furniture and fixtures		8,149			8,615
Leasehold improvements		23,308			24,225
Construction in progress		39,835			4,161
Finance lease right-of-use assets		288			420
		142,343			89,096
Less accumulated depreciation and amortization		(58,973	)		(48,968	)
Total	$	83,370		$	40,128

For the year ended December 31, 2023, 2022, and 2021, depreciation and amortization expense, excluding amortization of intangible assets, amortization of capitalized hosting arrangements, and write offs, was $18,412, $14,618 and $10,324, respectively.

For the year ended December 31, 2023, the Company wrote off $184, consisting of $175 of Digital Wholesale and $8 of U.S. Marketplace capitalized website development costs within wholesale and marketplace cost of revenue, respectively, in the consolidated income statements related to certain developed technology in which the Company decided to cease investment. For the year ended December 31, 2022, the Company wrote off $165 of U.S. Marketplace segment of capitalized website development costs within operating expense in the consolidated income statements related to certain developed technology in which the Company decided to cease investment. For the year ended December 31, 2021, the Company wrote off $2,481 of U.S. Marketplace segment of capitalized website development costs within operating expense in the consolidated income statements related to certain developed technology in which the Company decided to cease investment.

During the year ended December 31, 2023, capitalized equipment decreased $6,551 due primarily to the disposal of the data center assets as a result of the Company's migration onto a cloud-based hosting platform. The disposal of the data center assets resulted in a $460 gain on sale in our U.S. Marketplace segment, recognized within other (expense) income, net on the consolidated income statements.

During the year ended December 31, 2023, capitalized website development costs increased $20,789 due to continued net investment in the Company's product offerings.

During the year ended December 31, 2023, capitalized internal-use software costs increased $4,850 due to additions related to internal engineering and development tools.

During the year ended December 31, 2023, construction in progress increased $35,674 due to the buildout of the Company's future headquarters at 1001 Boylston Street, as discussed in Note 10 of these consolidated financial statements.

Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment, Net

As of December 31, 2023 and 2022, property and equipment, net consist of the following:


	As of December 31,
	2023			2022
Capitalized equipment	$	1,326		$	7,877
Capitalized internal-use software		12,279			7,429
Capitalized website development		57,158			36,369
Furniture and fixtures		8,149			8,615
Leasehold improvements		23,308			24,225
Construction in progress		39,835			4,161
Finance lease right-of-use assets		288			420
		142,343			89,096
Less accumulated depreciation and amortization		(58,973	)		(48,968	)
Total	$	83,370		$	40,128

Goodwill and Other Intangible Assets - Summary of Estimated Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 4,162
2025	3,037
2026	3,037
2027	3,037
2028	3,037
Thereafter	6,746
Net Carrying Amount	$ 23,056	$ 53,054

Segment and Geographic Information - Summary of Reconciliation Between Segment Income from Operations (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Segment Reporting [Abstract]

Total segment income from operations

$ 32,627

$ 108,478

^[1]

$ 148,268

^[1]

Other income, net

19,060

2,884

1,092

Income before income taxes

$ 51,687

$ 111,362

$ 149,360

[1]

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(11))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-30

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Revenue Recognition

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Revenue Recognition

3. Revenue Recognition

The following table summarizes revenue from contracts with customers by services and products for the year ended December 31, 2023, 2022, and 2021:


	Year Ended December 31,
	2023		2022		2021
Marketplace	$	698,236	$	658,771	$	636,942
Dealer-to-Dealer		109,802		320,119		224,831
Instant Max Cash Offer		106,204		676,145		89,600
Total	$	914,242	$	1,655,035	$	951,373

The Company provides disaggregation of revenue by services and products, by income statement presentation, by segment, and by geographic region.

Revenue by services and products is disaggregated by (i) marketplace services, (ii) Dealer-to-Dealer services and products, and (iii) IMCO services and products as disclosed above.

Revenue by income statement presentation is disaggregated by (i) marketplace, (ii) wholesale, and (iii) product revenue sources as disclosed in the consolidated income statements. Marketplace services are included within marketplace revenue in the consolidated income statements. Dealer-to-Dealer and IMCO services and products are included within both wholesale revenue and product revenue in the consolidated income statements.

Revenue by segment is disaggregated by (i) U.S. Marketplace and (ii) Digital Wholesale segments as disclosed in Note 14 of these consolidated financial statements. Marketplace services are included in the U.S. Marketplace segment and in the Other category of segment reporting. Dealer-to-Dealer and IMCO services and products are included in the Digital Wholesale segment.

Revenue by geographic region is disaggregated by (i) U.S. and (ii) International regions as disclosed in Note 14 of these consolidated financial statements. Marketplace services are provided in the U.S. and International regions. Dealer-to-Dealer and IMCO services and products are provided in the U.S. region.

The Company believes these categories best depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors.

ASC 606 requires that the Company disclose the aggregate amount of transaction price that is allocated to performance obligations that have not yet been satisfied as of the relevant year end.

For contracts with an original expected duration greater than one year, the aggregate amount of the transaction price allocated to the performance obligations that were unsatisfied as of December 31, 2023 was approximately $41.8 million, which the Company expects to recognize over the next twelve months.

For contracts with an original expected duration of one year or less, the Company has applied the practical expedient available under ASC 606 to not disclose the amount of transaction price allocated to unsatisfied performance obligations as of December 31, 2023. For performance obligations not satisfied as of December 31, 2023, and to which this expedient applies, the nature of the performance obligations, the variable consideration, and any consideration from contracts with customers not included in the transaction price is consistent with performance obligations satisfied as of December 31, 2023.

For the year ended December 31, 2023, 2022, and 2021, revenue recognized from amounts included in deferred revenue at the beginning of the period was $12,249, $12,784, and $9,137,respectively.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (c)
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-Topic 606
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-Section 50
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-Subparagraph (d)
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
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-Section 50
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//606/tableOfContent

+ Details

Income Taxes - Schedule of Domestic and Foreign Components of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]
United States	$ 50,632	$ 110,213	$ 148,037
Foreign	1,055	1,149	1,323
Income before income taxes	$ 51,687	$ 111,362	$ 149,360

- Definition

+ References

+ Details

Segment and Geographic Information

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Segment and Geographic Information

14. Segment and Geographic Information

Effective as of the fourth quarter of 2022, the Company revised its segment reporting from one reportable segment to two reportable segments, U.S. Marketplace and Digital Wholesale. The change in segment reporting was a triggering event for an evaluation of goodwill impairment. As such, the Company evaluated for goodwill impairment on December 31, 2022, and did not identify any impairment to its goodwill. The change in segment reporting was made to align with financial reporting results regularly provided to the Company's CODM to assess the business. The CODM reviews segment revenue and segment income (loss) from operations as a proxy for the performance of the Company’s operations.

The U.S. Marketplace segment derives revenue from marketplace services from customers within the U.S. The Digital Wholesale segment derives revenue from Dealer-to-Dealer and IMCO services and products which are sold on the CarOffer platform. The Company also has two operating segments which are individually immaterial and therefore aggregated into the Other category to reconcile reportable segments to the consolidated income statements. The Other category derives revenue from marketplace services from customers outside of the U.S.

Revenue and costs discretely incurred by reportable segments, including depreciation and amortization, are included in the calculation of reportable segment income (loss) from operations. For the year ended December 31, 2022, Digital Wholesale segment income (loss) from operations did not reflect certain Dealer-to-Dealer and IMCO-related capitalized website development amortization incurred by the U.S. Marketplace segment. During the three months ended March 31, 2023, the Company updated Digital Wholesale segment income (loss) from operations to reflect certain Dealer-to-Dealer and IMCO-related capitalized website development amortization incurred by the U.S. Marketplace segment and accordingly updated Digital Wholesale segment income (loss) from operations for the twelve months ended December 31, 2022, for comparative purposes. Digital Wholesale segment income (loss) from operations also reflects certain IMCO marketing and lead generation fees allocated from the U.S. Marketplace segment. Asset information by reportable segment is not provided to the CODM as asset information is assessed and reviewed on a consolidated basis.

For the years December 31, 2023, 2022, and 2021, segment revenue, segment income (loss) from operations, and segment depreciation and amortization are as follows:


	Year Ended December 31,
	2023		2022		2021
Segment Revenue
U.S. Marketplace	$	647,284	$	614,136	$	594,602
Digital Wholesale		216,005		996,264		314,431
Other		50,953		44,635		42,340
Total	$	914,242	$	1,655,035	$	951,373


	Year Ended December 31,
	2023			2022 (1)			2021 (1)
Segment Income (Loss) from Operations:
U.S. Marketplace	$	127,724		$	128,455		$	152,006
Digital Wholesale		(96,383	)		(11,834	)		6,526
Other		1,286			(8,143	)		(10,264	)
Total	$	32,627		$	108,478		$	148,268

(1)


	Year Ended December 31,
	2023		2022 (1)		2021 (1)
Segment Depreciation and Amortization:
U.S. Marketplace	$	11,561	$	11,554	$	10,648
Digital Wholesale		36,265		33,350		29,059
Other		648		430		769
Total	$	48,474	$	45,334	$	40,476

(1)

For the years December 31, 2023, 2022, and 2021, a reconciliation between total segment income from operations to consolidated income before income taxes is as follows:


	Year Ended December 31,
	2023		2022		2021
Total segment income from operations	$	32,627	$	108,478	$	148,268
Other income, net		19,060		2,884		1,092
Consolidated income before income taxes	$	51,687	$	111,362	$	149,360

As of December 31, 2023, 2022, and 2021, segment assets are as follows:


	Year Ended December 31,
	2023		2022(1)		2021(1)
Segment Assets:
U.S. Marketplace	$	607,307	$	525,103	$	449,230
Digital Wholesale		258,458		358,289		446,823
Other		53,162		43,710		35,521
Total	$	918,927	$	927,102	$	931,574

(1)

For the years ended December 31, 2023, 2022, and 2021, revenue by geographical region is as follows:


	Year Ended December 31,
	2023		2022		2021
Revenue by Geographic Region:
United States	$	863,289	$	1,610,400	$	909,033
International		50,953		44,635		42,340
Total	$	914,242	$	1,655,035	$	951,373

As of December 31, 2023, 2022, and 2021, long-lived assets outside of the U.S. were immaterial.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (d)
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Publisher FASB
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-Topic 280
-Name Accounting Standards Codification
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-URI https://asc.fasb.org//280/tableOfContent

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
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-Section 50
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

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-Topic 280
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-Paragraph 21
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-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

+ Details

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Payables and Accruals [Abstract]
Increase in accrued bonus	$ 4,240

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Schedule of Domestic and Foreign Components of Income Before Income Taxes

For the years ended December 31, 2023, 2022, and 2021, the domestic and foreign components of income before income taxes are as follows:


	Year Ended December 31,
	2023		2022		2021
United States	$	50,632	$	110,213	$	148,037
Foreign		1,055		1,149		1,323
Income before income taxes	$	51,687	$	111,362	$	149,360

Schedule of Provision for (Benefit from) Income Taxes

For the years ended December 31, 2023, 2022, and 2021, the components of the provision for (benefit from) income taxes are as follows:


	Year Ended December 31,
	2023			2022			2021
Current provision:
Federal	$	52,352		$	43,207		$	22,133
State		14,614			11,140			10,438
Foreign		532			175			253
		67,498			54,522			32,824
Deferred (benefit) provision:
Federal		(37,583	)		(20,278	)		5,698
State		(272	)		(1,789	)		669
Foreign		(9	)		(47	)		(204	)
		(37,864	)		(22,114	)		6,163
Income tax provision	$	29,634		$	32,408		$	38,987

Schedule of Effective Tax Rates

For the year ended December 31, 2023, 2022, and 2021, the components of the effective tax rate are as follows:


	Year Ended December 31,
	2023			2022			2021
U.S. federal taxes at statutory rate		21.0	%		21.0	%		21.0	%
State taxes, net of federal benefit		22.1			7.7			7.5
Nondeductible expenses		1.4			0.5			0.3
Stock compensation		7.3			2.8			0.3
Foreign rate differential		(0.1	)		(0.1	)		(0.2	)
Federal and state credits		(9.5	)		(4.7	)		(2.6	)
Disallowed officer compensation		0.4			0.8			1.0
Investment in partnership		4.7			1.0			(0.3	)
Federal, state, and foreign provision to return differences		(1.4	)		(0.8	)		(0.7	)
Uncertain tax provision		0.4			0.5			—
CarOffer and AutoList M&A		2.9			—			—
Other		0.0		(0.0)				(0.2	)
Consolidated effective tax rate		49.2	%		28.7	%		26.1	%
Effective tax rate attributable to redeemable noncontrolling interest		(4.7	)		(1.0	)		0.2
Effective tax rate attributable to CarGurus, Inc.		44.5	%		27.7	%		26.3	%

Schedule of Income Tax Effect of Each Type of Temporary Difference and Carryforward

As of December 31, 2023 and 2022, the approximate income tax effect of each type of temporary difference and carryforward is as follows:


	As of December 31,
	2023			2022
Deferred tax assets:
Net operating loss carryforwards	$	304		$	461
Credit carryforwards		928			928
Stock-based compensation		5,353			5,441
Lease liability		47,907			13,557
Investment in partnership		—			8,325
Accruals and reserves		4,642			3,770
Intangible assets		20,294			—
Capitalized research and development		45,468			25,342
		124,896			57,824
Valuation Allowance		(305	)		(258	)
		124,591			57,566
Deferred tax liabilities:
Prepaid expenses		(2,459	)		(2,466	)
Deferred commissions		(5,531	)		(4,200	)
Right of use assets		(42,531	)		(11,237	)
Intangible assets		—			(733	)
Capital lease		(72	)		—
Property and equipment		(700	)		(3,496	)
		(51,293	)		(22,132	)
Net deferred tax assets	$	73,298		$	35,434

Schedule of Unrecognized Tax Benefits, Excluding Interest and Penalties

As of December 31, 2023 and 2022, changes in the gross uncertain tax position (excluding interest and penalties) are as follows:


	As of December 31,
	2023		2022
Unrecognized tax benefits at beginning of year	$	598	$	—
Increase related to current year tax provision		178		198
Increase related to prior year tax provision		36		400
Unrecognized tax benefits at end of year	$	812	$	598

Summary of Significant Accounting Policies - Weighted Average Assumptions Utilized to Determine Fair Value of Options Granted (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Expected volatility	48.03%	50.95%
Risk-free interest rate	1.47%	0.69%
Expected term (in years)	6 years 1 month 9 days	6 years 21 days

Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Summary of Segment Revenue, Income (Loss) and Depreciation and Amortization

For the years December 31, 2023, 2022, and 2021, segment revenue, segment income (loss) from operations, and segment depreciation and amortization are as follows:


	Year Ended December 31,
	2023		2022		2021
Segment Revenue
U.S. Marketplace	$	647,284	$	614,136	$	594,602
Digital Wholesale		216,005		996,264		314,431
Other		50,953		44,635		42,340
Total	$	914,242	$	1,655,035	$	951,373


	Year Ended December 31,
	2023			2022 (1)			2021 (1)
Segment Income (Loss) from Operations:
U.S. Marketplace	$	127,724		$	128,455		$	152,006
Digital Wholesale		(96,383	)		(11,834	)		6,526
Other		1,286			(8,143	)		(10,264	)
Total	$	32,627		$	108,478		$	148,268

(1)


	Year Ended December 31,
	2023		2022 (1)		2021 (1)
Segment Depreciation and Amortization:
U.S. Marketplace	$	11,561	$	11,554	$	10,648
Digital Wholesale		36,265		33,350		29,059
Other		648		430		769
Total	$	48,474	$	45,334	$	40,476

(1)

Summary of Reconciliation Between Segment Income from Operations

For the years December 31, 2023, 2022, and 2021, a reconciliation between total segment income from operations to consolidated income before income taxes is as follows:


	Year Ended December 31,
	2023		2022		2021
Total segment income from operations	$	32,627	$	108,478	$	148,268
Other income, net		19,060		2,884		1,092
Consolidated income before income taxes	$	51,687	$	111,362	$	149,360

Summary of Assets by Segment

As of December 31, 2023, 2022, and 2021, segment assets are as follows:


	Year Ended December 31,
	2023		2022(1)		2021(1)
Segment Assets:
U.S. Marketplace	$	607,307	$	525,103	$	449,230
Digital Wholesale		258,458		358,289		446,823
Other		53,162		43,710		35,521
Total	$	918,927	$	927,102	$	931,574

(1)

Summary of Revenue by Geographical Region

For the years ended December 31, 2023, 2022, and 2021, revenue by geographical region is as follows:


	Year Ended December 31,
	2023		2022		2021
Revenue by Geographic Region:
United States	$	863,289	$	1,610,400	$	909,033
International		50,953		44,635		42,340
Total	$	914,242	$	1,655,035	$	951,373

Income Taxes - Schedule of Effective Tax Rates (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. federal taxes at statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	22.10%	7.70%	7.50%
Nondeductible expenses	1.40%	0.50%	0.30%
Stock compensation	7.30%	2.80%	0.30%
Foreign rate differential	(0.10%)	(0.10%)	(0.20%)
Federal and state credits	(9.50%)	(4.70%)	(2.60%)
Disallowed officer compensation	0.40%	0.80%	1.00%
Investment in partnership	4.70%	1.00%	(0.30%)
Federal, state, and foreign provision to return differences	(1.40%)	(0.80%)	(0.70%)
Uncertain tax provision	0.40%	0.50%
CarOffer and AutoList M&A	2.90%
Other	0.00%	0.00%	(0.20%)
Consolidated effective tax rate	49.20%	28.70%	26.10%
Effective tax rate attributable to redeemable noncontrolling interest	(4.70%)	(1.00%)	0.20%
Effective tax rate attributable to CarGurus, Inc	44.50%	27.70%	26.30%

Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of match	50.00%	50.00%	50.00%
Defined contribution plan, maximum annual contributions per employee, percent	8.00%	8.00%	6.00%
Annual maximum amount of employee contributions			$ 5,000,000
Defined contribution plan, employer contribution	$ 6,575,000	$ 5,498,000	2,960,000
CarOffer
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of match	50.00%	50.00%
Defined contribution plan, maximum annual contributions per employee, percent	6.00%	6.00%
Annual maximum amount of employee contributions	$ 5,000,000	$ 5,000,000	$ 0

Stock-based Compensation - Summary of Restricted Stock Unit Activity (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of Shares
Unvested outstanding, beginning balance	4,484,291
Granted	4,133,865
Vested	(2,440,510)
Forfeited	(489,935)
Unvested outstanding, ending balance	5,687,711	4,484,291
Weighted-Average Grant Date Fair Value
Unvested outstanding, beginning balance	$ 29.36
Granted	17.47	$ 28.94	$ 33.83
Vested	26.83
Forfeited	24.3
Unvested outstanding, ending balance	$ 22.02	$ 29.36
Aggregate Intrinsic Value
Unvested outstanding, balance	$ 137,415	$ 62,825

Organization and Business Description

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Organization and Business Description

1. Organization and Business Description

CarGurus, Inc. (the "Company") is a multinational, online automotive platform for buying and selling vehicles that is building upon its industry-leading listings marketplace with both digital retail solutions and the CarOffer, LLC ("CarOffer") online wholesale platform. The CarGurus platform gives consumers the confidence to purchase and/or sell a vehicle either online or in person, and it gives dealerships the power to accurately price, effectively market, instantly acquire, and quickly sell vehicles, all with a nationwide reach. The Company uses proprietary technology, search algorithms, and data analytics to bring trust, transparency, and competitive pricing to the automotive shopping experience.

The Company operates principally in the United States (the “U.S.”). In the U.S., it also operates as independent brands the Autolist online marketplace and the CarOffer online wholesale platform, both of which it wholly owns. In addition to the U.S., the Company operates online marketplaces under the CarGurus brand in Canada and the United Kingdom (the “U.K.”). In the U.K., it also operates as an independent brand the PistonHeads online marketplace, which it wholly owns.

The Company has subsidiaries in the U.S., Canada, Ireland, and the U.K. and additionally it has two reportable segments, U.S. Marketplace and Digital Wholesale. See Note 14 of these consolidated financial statements for further segment reporting and geographic information.

The Company is subject to a number of risks and uncertainties common to companies in its and similar industries and stages of development including, but not limited to, rapid technological changes, competition from substitute products and services from larger companies, management of international activities, protection of proprietary rights, patent litigation, and dependence on key individuals.

Debt

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Debt

9. Debt

As of December 31, 2023 and 2022, the Company had no long-term debt outstanding.

Revolving Credit Facility

On September 26, 2022, the Company entered into a Credit Agreement (the “Credit Agreement”) with PNC Bank, National Association, as administrative agent and collateral agent and an L/C Issuer (as defined in the Credit Agreement), and the other lenders, L/C Issuers, and parties thereto from time to time. The Credit Agreement consists of a revolving credit facility (the "2022 Revolver"), which allows the Company to borrow up to $400.0 million, $50.0 million of which may be comprised of a letter of credit sub-facility (the "2022 Revolver Sub-facility"). The borrowing capacity under the Credit Agreement may be increased in accordance with the terms and subject to the adjustments as set forth in the Credit Agreement. Specifically, the borrowing capacity may be increased by an amount up to the greater of $250.0 million or 100% of Four Quarter Consolidated EBITDA (as defined in the Credit Agreement) if certain criteria are met and subject to certain restrictions. Any such increase requires lender approval. Proceeds of any borrowings may be used for general corporate purposes. The 2022 Revolver is scheduled to mature on September 26, 2027.

The applicable interest rate is, at the Company's option, based on a number of different benchmark rates and applicable spreads, based on the ratio of the outstanding principal amount of the Company’s secured indebtedness to the trailing four quarters of consolidated EBITDA (as determined under the Credit Agreement, the “Consolidated Secured Net Leverage Ratio”). The Credit Agreement also requires the Company to pay a commitment fee to the lenders with respect of the unutilized revolving commitments at a rate ranging from 0.125% to 0.175% per annum based on the Consolidated Secured Net Leverage Ratio, as determined on a quarterly basis.

The 2022 Revolver is secured by a first priority lien on substantially all tangible and intangible property of the Company, as well as any future guarantors, and pledges of the equity of CarOffer and certain wholly-owned subsidiaries, in each case subject to certain exceptions, limitations, and exclusions from the collateral. The Credit Agreement includes customary events of default and requires the Company to comply with customary affirmative and negative covenants, including a financial covenant requiring that the Company not exceed certain Consolidated Secured Net Leverage Ratio ranges at the end of each fiscal quarter. The Company was in compliance with all covenants as of December 31, 2023.

As of December 31, 2023, there were no borrowings and $9,627 in letters of credit outstanding under the 2022 Revolver, which reduces the borrowing capacity under the 2022 Revolver to $390,373. As of December 31, 2022, there were no borrowings and no letters of credit outstanding under the 2022 Revolver.

As of December 31, 2023, deferred financing costs were $1,927. As of December 31, 2022, deferred financing costs were $2,442. For the year ended December 31, 2023, amortization expense associated with deferred financing costs was $515. For the year ended December 31, 2022, amortization expense associated with deferred financing costs was $136.

As of December 31, 2023 and 2022, commitment fees under the 2022 Revolver were immaterial.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 470
-Name Accounting Standards Codification
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-URI https://asc.fasb.org//470/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
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-Paragraph 1C
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Paragraph 1E
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Paragraph 1I
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

+ Details

Stock-based Compensation

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Stock-based Compensation

11. Stock‑based Compensation

CarGurus Equity Incentive Plans

The Company’s Amended and Restated 2006 Equity Incentive Plan (the “2006 Plan”) provided for the issuance of non-qualified stock options, restricted stock, and stock awards to the Company’s employees, officers, directors, and consultants. The 2006 Plan authorized up to an aggregate of 3,444,668 shares of the Company's Class B common stock for such issuances. In conjunction with the effectiveness of the Company’s 2015 Equity Incentive Plan (the “2015 Plan”), the Board voted that no further stock options or other equity-based awards may be granted under the 2006 Plan.

In 2015 the Board adopted the 2015 Plan, which became effective on June 26, 2015. The 2015 Plan provided for the issuance of stock-based incentives to employees, consultants, and non-employee directors. As of the effective date of the 2015 Plan, up to 603,436 shares of common stock were authorized for issuance under the 2015 Plan. The 2015 Plan was amended and restated effective August 6, 2015 to permit the granting of RSUs under the 2015 Plan, to remove Class B common stock from the pool of shares available for issuance under the 2015 Plan, and to make certain other desired changes. The 2015 Plan was further amended and restated at October 15, 2015 to add a ten-year term and to make certain other desired changes.

The 2015 Plan was further amended and restated effective August 22, 2016 to merge the 2006 Plan into the 2015 Plan, to increase the number of shares of Class A common stock that may be issued under the 2015 Plan, and to lengthen the term of the 2015 Plan to expire on August 21, 2026. In addition, pursuant to this amendment and restatement of the 2015 Plan, prior to giving effect to the recapitalization that occurred on June 21, 2017, there were (i) 618,691 shares of Class A common stock, plus (ii) 802,562 shares of Class B common stock authorized under the 2015 Plan; provided, however, that (1) the number of shares of Class A common stock was increased, on a share for share basis, by the number of shares of Class B common stock that were (a) subject to outstanding options granted under the 2006 Plan that expired, terminated, or were canceled for any reason without having been exercised, (b) surrendered in payment of the exercise price of outstanding options granted under the 2006 Plan, or (c) withheld in satisfaction of tax withholding upon exercise of outstanding options granted under the 2006 Plan, and the number of shares of Class B common stock reserved under the amended and restated 2015 Plan was decreased, on a corresponding share for share basis, (2) no new awards of Class B common stock could be granted under the amended and restated 2015 Plan, and (3) except with respect to outstanding options granted under the 2006 Plan that were exercised on or after the date of the amendment and restatement, no Class B common stock could be issued under the 2015 Plan.

In connection with the recapitalization that occurred on June 21, 2017, the 2015 Plan was further amended and restated to account for each outstanding common stock option being adjusted such that each share of common stock underlying such option became two shares of Class A common stock and four shares of Class B common stock underlying such option, and each outstanding RSU being adjusted such that each share of common stock issuable upon settlement of such RSU became two shares of Class A common stock and four shares of Class B common stock issuable upon settlement of such RSU. Pursuant to the 2015 Plan as further amended in connection with the recapitalization, there were (i) 3,181,740 shares of Class A common stock and (ii) 5,161,644 shares of Class B common stock authorized for issuance under the 2015 Plan.

In connection with the Company's initial public offering ("IPO"), in October 2017 the Board adopted, and the Company’s stockholders approved, the 2017 Plan for the purpose of granting incentive stock options, non-qualified stock options, stock awards, stock units, other share-based awards, and cash awards to employees, advisors, and consultants to the Company and its subsidiaries and non-employee members of the Board. The 2017 Plan is the successor to the 2015 Plan. The 2017 Plan authorizes the issuance or transfer of the sum of: (i) 7,800,000 shares of the Company’s Class A common stock, plus (ii) the number of shares of Class A common stock (up to 4,500,000 shares) equal to the sum of (x) the number of shares of Class A common stock and Class B common stock of the Company subject to outstanding awards under the 2015 Plan as of October 10, 2017, that terminate, expire, or are canceled, forfeited, exchanged, or surrendered on or after October 10, 2017, without having been exercised, vested, or paid prior to October 10, 2017, including shares tendered or withheld to satisfy tax withholding obligations with respect to outstanding grants under the 2015 Plan, plus (y) the number of shares of Class A common stock reserved for issuance under the 2015 Plan that remain available for grant under the 2015 Plan as of October 10, 2017. The aggregate number of shares of Class A common stock that may be issued or transferred under the 2017 Plan pursuant to incentive stock options will not exceed 12,300,000 shares of Class A common stock. Unless determined otherwise by the Compensation Committee of the Board, as of the first trading day of January of each calendar year during the term of the 2017 Plan (excluding any extensions), eligible beginning with calendar year 2019, an additional number of shares of Class A common stock will be added to the number of shares of the Company’s Class A common stock authorized to be issued or transferred under the 2017 Plan and the number of shares authorized to be issued or transferred pursuant to incentive stock options, equal to 4% of the total number of shares of Class A common stock outstanding on the last trading day in December of the immediately preceding calendar year, or 6,000,000 shares, whichever is less, or such lesser amount as determined by the Board (the “Evergreen Increase”). The Compensation Committee of the Board determined to not effectuate the Evergreen Increase that was otherwise scheduled to have occurred on each of January 2, 2019, January 2, 2020, and January 4, 2021. On January 3, 2022, an additional 4,070,921 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase. On January 3, 2023, an additional 4,065,466 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase. On January 2, 2024, an additional 3,687,010 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase. In conjunction with the adoption of the 2017 Plan, options and RSUs outstanding under the 2015 Plan will remain outstanding but no additional grants will be made from the 2015 Plan.

As of December 31, 2023, 6,236,628 shares of Class A common stock were available for issuance under the 2017 Plan.

CarOffer Equity Incentive Plans

The 2020 CO Plan provided for the issuance of CO Incentive Units to CarOffer’s employees, officers, managers, and consultants. The 2020 CO Plan authorized up to an aggregate of 485,714 CO Incentive Units for such issuances, all of which were issued prior to the close of the 2021 CarOffer Transaction. At the time of the 2021 Closing, 142,857 CO Incentive Units were accelerated and redeemed. The compensation relating to these CO Incentive Units was deemed to be outside of consideration transferred. Therefore, for the year ended December 31, 2021, the Company recognized an additional $1,229 of stock-based compensation expense. As a result of the 2023 CarOffer Transaction, all CO Incentive Units were accelerated and redeemed and, thus, as of December 31, 2023, there were no CO Incentive Units unvested. During the year ended December 31, 2023, no CO Incentive Units were granted, vested, or forfeited. As of December 31, 2023, there is no unrecognized stock‑based compensation expense related to the unvested CO Incentive Units, as a result of the redemption of the awards following the 2021 CarOffer Transaction. As of December 31, 2022, 342,857 CO Inventive Units were unvested.

As of December 31, 2023, there were no CO Incentive Units available for issuance under the 2020 CO Plan.

The Vesting Agreement provides for the vesting of the Subject Units beneficially owned by the T5 Holders, which vest in accordance with the terms described in Note 2 of these consolidated financial statements. As a result of the 2023 CarOffer Transaction, all Subject Units were accelerated and redeemed and, thus, as of December 31, 2023, no Subject Units were unvested. As of December 31, 2022, 288,395 Subject Units were issued and unvested, respectively. During the year ended December 31, 2023, there were no Subject Units granted or vested. During the year ended December 31, 2022, no Subject Units were granted and 144,197 Subject Units vested. During the year ended December 31, 2023 and 2022, no Subject Units were forfeited. As of December 31, 2023, there is no unrecognized stock‑based compensation expense related to the unvested Subject Units, as a result of the redemption of the awards following the 2023 CarOffer Transaction.

As of December 31, 2023, there were no Subject Units available for issuance under the Vesting Agreement.

The 2021 CO Plan provides for an incentive equity grant structure whereby 2021 Incentive Units will be granted to CIE and 2021 CO Plan grantees will receive an associated CIE Interest, with back-to-back vesting between the 2021 Incentive Units and the associated CIE Interest. The 2021 CO Plan authorized up to an aggregate of 228,571 2021 Incentive Units for such issuances.

As of December 31, 2023, there were no 2021 Incentive Units available for issuance under the 2021 CO Plan.

All CO Incentive Units and Subject Units were accelerated and redeemed in connection with the 2023 CarOffer Transaction. As a result, there were no CO Incentive Units, Subject Units or 2021 Incentive Units as of December 31, 2023.

Stock Options

During the year ended December 31, 2023, stock option activity is as follows:


	Common Stock			Weighted- Average Exercise Price for Equity		Weighted- Average Remaining Contractual Life (In Years)		Aggregate Intrinsic Value(1)
Outstanding, December 31, 2022		826,609		$	25.22		6.2	$	3,172
Granted		—			—
Exercised		(15,834	)		4.69				229
Forfeited or Expired		(34,681	)		35.61
Outstanding, December 31, 2023		776,094		$	25.17		5.3	$	5,442
Exercisable as of December 31, 2023		590,401		$	21.83		4.7	$	5,442

(1)

During the year ended December 31, 2022, there were 30,266 options granted. During the year ended December 31, 2021, there were 619,618 options granted.

During the years ended December 31, 2022 and 2021, the aggregate intrinsic value for options exercised was $3,774 and $6,027, respectively.

As of December 31, 2023, there was $2,623 unrecognized stock‑based compensation expense related to unvested stock options that is expected to be recognized over a weighted‑average period of 1.3 years.

Restricted Stock Units

During the year ended December 31, 2023, RSU activity is as follows:


	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Unvested outstanding, December 31, 2022		4,484,291		$	29.36	$	62,825
Granted		4,133,865			17.47
Vested		(2,440,510	)		26.83
Forfeited		(489,935	)		24.30
Unvested outstanding, December 31, 2023		5,687,711		$	22.02	$	137,415

During the years ended December 31, 2022 and 2021, the weighted-average grant-date fair value of RSUs granted was $28.94 and $33.83 per share, respectively.

During the years ended December 31, 2022 and 2021, RSUs that vested and settled totaled 1,649,294 and 1,575,206, respectively.

During the years ended December 31, 2022 and 2021, the total fair value of RSUs vested was $55,136 and $52,423, respectively.

As of December 31, 2023, there was $108,714 of unrecognized stock‑based compensation expense related to unvested RSUs that is expected to be recognized over a weighted‑average period of 2.5 years.

Stock-based Compensation Expense


	Year Ended December 31,
	2023		2022			2021
Options	$	2,386	$	2,553		$	2,471
Restricted Stock Units		55,527		52,224			52,916
CO Incentive Units and Subject Units		26,552		(21,095	)		22,323
Noncontrolling Interest Units		28,991		—			—
Total	$	113,456	$	33,682		$	77,710

CO Incentive Units and Subject Units stock-based compensation expense increased $47,647, primarily due to the redemption of the units in connection with the 2023 CarOffer Transaction. See Note 4 of these consolidated financial statements for additional information. Additionally, this increase was due in part to the prior-year revaluation of these liability-based awards which brought the value down to zero, thus resulting in negative expense for the year ended December 31, 2022.

Noncontrolling Interest Units, which were employee-owned, increased $28,991 for the year ended December 31, 2023 compared to the year ended December 31, 2022, due to the redemption of the Noncontrolling Interest Units in connection with the completion of the 2023 CarOffer Transaction.


	Year Ended December 31,
	2023		2022		2021
Cost of revenue	$	2,370	$	475	$	417
Sales and marketing expense		13,710		7,733		12,801
Product, technology, and development expense		25,934		20,266		22,289
General and administrative expense		71,442		5,208		42,203
Total	$	113,456	$	33,682	$	77,710

For the years ended December 31, 2023, 2022, and 2021, stock-based compensation expense excluded $5,472, $4,468, and $3,247, respectively, of capitalized website development costs, capitalized internal-use software costs, and capitalized hosting arrangements.

For the years ended December 31, 2023, 2022, and 2021, the income tax benefit from stock-based compensation expense, recognized through the Company's deferred tax asset in the consolidated balance sheets was $5,353, $5,441, and $5,301, respectively.

During the years ended December 31, 2023, 2022, and 2021, the Company withheld 840,995, 566,267, and 527,237 shares of Class A common stock, respectively, to satisfy employee tax withholding requirements for net share settlements of RSUs. The shares withheld return to the authorized, but unissued pool under the 2017 Plan and can be reissued by the Company. For the years ended December 31, 2023, 2022, and 2021, total payments to satisfy employee tax withholding requirements for net share settlements of RSUs, were $15,729, $16,025, and $15,388, respectively, and are reflected as a financing activity in the consolidated statements of cash flows.

For the year ended December 31, 2023, total payments to satisfy employee tax withholding requirements for net share settlements of RSUs were $15,729, of which $15,597 was paid and reflected as a financing activity in the consolidated statements of cash flows. For the year ended December 31, 2022, total payments to satisfy employee tax withholding requirements for net share settlements of RSUs were $16,025, of which $16,022 was paid and reflected as a financing activity in the consolidated statements of cash flows.

2023 CarOffer Transaction

In connection with the 2023 CarOffer Transaction, the Company redeemed all remaining CO Incentive Units, Subject Units, and Noncontrolling Interest Units.

Certain of the Noncontrolling Interest Units were employee owned. The Company paid $28,991 for these units and accounted for this portion of the 2023 CarOffer Transaction as stock-based compensation in its consolidated income statements. For all other Noncontrolling Interest Units, the Company reduced the remaining redeemable noncontrolling interest on its consolidated balance sheets to zero and recorded excess cash paid to these unit holders as a deemed dividend of $5,838.

As part of the 2023 CarOffer Transaction, Subject Units and CO Incentive Units were modified such that any remaining unvested units received accelerated vesting. As part of the 2023 CarOffer Transaction, the Company purchased all outstanding Subject Units and CO Incentive Units and recognized approximately $20,655 of stock-based compensation in its consolidated income statements.

Common Stock Reserved for Future Issuance

As of December 31, 2023, the Company had reserved the following shares of Class A common stock for future issuance:


Common stock options outstanding			776,094
Unvested restricted stock units outstanding			5,687,711
Shares available for issuance under the 2017 Plan			6,236,628
Total shares of authorized common stock reserved for future issuance			12,700,433

Common Stock Share Repurchases

On November 7, 2023, the Company announced that the Board authorized a share repurchase program (the “2024 Share Repurchase Program”), pursuant to which the Company may, from time to time, purchase shares of its Class A common stock for an aggregate purchase price not to exceed $250.0 million. Share repurchases under the 2024 Share Repurchase Program may be made through a variety of methods, including but not limited to open market purchases, privately negotiated transactions, and transactions that may be effected pursuant to one or more plans under Rule 10b5-1 and/or Rule 10b-18 of the Securities Exchange Act of 1934. The 2024 Share Repurchase Program does not obligate the Company to repurchase any minimum dollar amount or number of shares. The 2024 Share Repurchase Program has an effective date of January 1, 2024, and an expiration date of December 31, 2024, and prior to its expiration may be modified, suspended, or discontinued by the Board at any time without prior notice. All repurchased shares under the 2024 Share Repurchase Program will be retired. The Company expects to fund share repurchases under the 2024 Share Repurchase Program through cash on hand and cash generated from operations.

On December 8, 2022, the Company announced that the Board authorized a share repurchase program (the “2022 Share Repurchase Program”) pursuant to which the Company could, from time to time, purchase shares of its Class A common stock for an aggregate purchase price not to exceed $250.0 million. The 2022 Share Repurchase Program expired on December 31, 2023. The 2022 Share Repurchase Program did not obligate the Company to repurchase any minimum dollar amount or number of shares. All repurchased shares under the 2022 Share Repurchase Program were retired. The Company funded share repurchases under the 2022 Share Repurchase Program through cash on hand and cash generated from operations.

During the year ended December 31, 2023, the Company repurchased and retired 11,076,755 shares for $204,127, exclusive of commissions and excise tax, at an average cost of $18.43 per share, under the 2022 Share Repurchase Program. As of December 31, 2023, the 2022 Share Repurchase Program expired.

Earnings Per Share - Schedule of Potentially Dilutive Common Stock Equivalents Excluded from Calculation of Diluted Weighted-average Shares Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock Options Outstanding
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted weighted-average shares outstanding	551,196	587,494	617,504
Restricted Stock Units Outstanding
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted weighted-average shares outstanding	2,333,489	2,634,463	2,867,330
Co Incentive Units Subject Units and noncontrolling interest
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted weighted-average shares outstanding			1,509,750

Income Taxes - Schedule of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 598	$ 0
Increase related to current year tax provisions	178	198
Increase related to prior year tax provision	36	400
Unrecognized tax benefits at end of year	$ 812	$ 598

Summary of Significant Accounting Policies - Summary of Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Credit Loss [Abstract]
Balance at Beginning of Period	$ 1,809	$ 420
Provision	378	1,769	$ 999
Write–offs, net of recoveries	(1,577)	(380)
Balance at End of Period	$ 610	$ 1,809	$ 420

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net Income (Loss)	$ 36,942	$ 84,387	$ 109,244

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 250
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/exampleRef
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+ Details

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Depreciation and amortization excluding amortization of intangible assets and capitalized hosting arrangements	$ 18,412	$ 14,618	$ 10,324
Write-offs in capitalized website development costs	184
Digital Wholesale and U.S. Marketplace
Property, Plant and Equipment [Line Items]
Write-offs in capitalized website development costs	184
Digital Wholesale
Property, Plant and Equipment [Line Items]
Write-offs in capitalized website development costs	175
U.S. Marketplace
Property, Plant and Equipment [Line Items]
Write-offs in capitalized website development costs	8	$ 165	2,481
Capitalized Website Development
Property, Plant and Equipment [Line Items]
Increase (decrease) in property and equipment	20,789
Capitalized Equipment
Property, Plant and Equipment [Line Items]
Increase (decrease) in property and equipment	(6,551)
Capitalized Equipment \| U.S. Marketplace
Property, Plant and Equipment [Line Items]
Gain on sale of asset	460
Construction in Progress
Property, Plant and Equipment [Line Items]
Increase (decrease) in property and equipment	35,674
Capitalized Internal-Use Software
Property, Plant and Equipment [Line Items]
Write-offs in capitalized website development costs			$ 2,481
Increase (decrease) in property and equipment	$ 4,850

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2023

Payables and Accruals [Abstract]

Schedule of Accrued Expenses, Accrued Income Taxes and Other Current Liabilities

As of December 31, 2023 and 2022, accrued expenses, accrued income taxes and other current liabilities consist of the following:


	As of December 31,
	2023		2022
Accrued bonus	$	15,247	$	11,007
Other accrued expenses and other current liabilities		18,471		28,186
Total	$	33,718	$	39,193

Commitments and Contingencies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) Days	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Nov. 14, 2023 ft²	Feb. 03, 2023 ft²
Commitments And Contingencies [Line Items]
Lease term description	non-cancellable lease terms through 2033
Sublease term description	non-cancellable lease terms through 2025
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Operating lease, option to extend	option to extend the lease term up to two additional periods of five years
Sublease option to extend	option to extend the sublease term up to one additional period of three years.
Restricted cash	$ 2,563,000	$ 14,615,000
Lease costs	34,218,000	16,732,000	$ 15,844,000
Sublease income	$ 1,897,000	$ 1,809,000	0
Weighted average remaining lease term	13 years 1 month 6 days	7 years 1 month 6 days
Weighted average discount rate	5.70%	4.90%
Maximum potential amount of future payments required to make under guarantees	$ 10,158,000	$ 31,056,000	76,075,000
Guarantee income	1,890,000	10,026,000	5,537,000
Exercise of guarantee net loss	417,000	4,568,000
1001 Boylston Street
Commitments And Contingencies [Line Items]
Expected contractual obligations and commitments in connection with lease net of tenant reimbursements	69,815,000
Contractual obligations incurred expenses	40,561,000
Tenant improvement allowance reimbursements	2,891,000
Contractual obligations capitalized amount	40,325,000
Gross contract commitments	$ 46,473,000
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Operating lease, option to extend	options to extend the lease term for two additional periods of five years
Area of land \| ft²				30,913	225,428
1001 Boylston Street \| Letter of Credit Facility
Commitments And Contingencies [Line Items]
Letter of credit facility	$ 9,627,000
1001 Boylston Street \| Property and Equipment, Net
Commitments And Contingencies [Line Items]
Contractual obligations capitalized amount	39,835,000
1001 Boylston Street \| Prepaid Expenses, Prepaid Income Taxes and Other Current Assets
Commitments And Contingencies [Line Items]
Contractual obligations capitalized amount	$ 490,000
Car Offer
Commitments And Contingencies [Line Items]
Guarantees, description	provides certain guarantees to dealers through products such as its 45-Day Guarantee and OfferGuard service offerings on the CarOffer platform, which are accounted for under ASC 460.
Number of days guarantee period \| Days	45
Maximum potential amount of future payments required to make under guarantees	$ 10,158,000	$ 31,056,000	$ 76,075,000

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities

12 Months Ended

Dec. 31, 2023

Payables and Accruals [Abstract]

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities

8. Accrued Expenses, Accrued Income Taxes and Other Current Liabilities

As of December 31, 2023 and 2022, accrued expenses, accrued income taxes and other current liabilities consist of the following:


	As of December 31,
	2023		2022
Accrued bonus	$	15,247	$	11,007
Other accrued expenses and other current liabilities		18,471		28,186
Total	$	33,718	$	39,193

The increase of $4,240 in accrued bonus was due to increased bonus payout metric attainment.

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Changes in Carrying Value of Goodwill

As of December 31, 2023, changes in the carrying value of goodwill are as follows:


	U.S. Marketplace		Digital Wholesale		Other		Total
Balance as of December 31, 2022	$	12,477	$	130,451	$	14,539	$	157,467
Foreign currency translation adjustment		—		—		431		431
Balance as of December 31, 2023	$	12,477	$	130,451	$	14,970	$	157,898

Summary of Other Intangible Assets

As of December 31, 2023 and 2022, intangible assets consist of the following:


	As of December 31, 2023
	Weighted Average Remaining Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Accumulated Impairment		Net Carrying Amount
Brand		7.4	$	32,193	$	10,262	$	—	$	21,931
Customer relationships		0.0		19,870		19,620		—		250
Developed technology		0.0		65,212		63,690		647		875
Total			$	117,275	$	93,572	$	647	$	23,056


	As of December 31, 2022
	Weighted Average Remaining Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Accumulated Impairment		Net Carrying Amount
Brand		8.4	$	32,129	$	7,227	$	—	$	24,902
Customer relationships		1.0		19,870		13,609		—		6,261
Developed technology		1.0		65,212		42,674		647		21,891
Total			$	117,211	$	63,510	$	647	$	53,054

Summary of Estimated Amortization Expense of Intangible Assets

As of December 31, 2023, estimated amortization expense of intangible assets for future periods is as follows:


Year Ending December 31,	Amortization Expense
2024		4,162
2025		3,037
2026		3,037
2027		3,037
2028		3,037
Thereafter		6,746
Total	$	23,056

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
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+ Details