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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2020	Jul. 30, 2020
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Registrant Name	CARGURUS, INC.
Trading Symbol	CARG
Entity Central Index Key	0001494259
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity File Number	001-38233
Entity Tax Identification Number	04-3843478
Entity Address, Address Line One	2 Canal Park
Entity Address, Address Line Two	4th Floor
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02141
City Area Code	617
Local Phone Number	354-0068
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE
Title of 12(b) Security	Class A Common Stock, par value $0.001 per share
Security Exchange Name	NASDAQ
Class A Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		93,000,322
Class B Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		19,975,155

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 133,199	$ 59,920
Investments	43,000	111,692
Accounts receivable, net of allowance for doubtful accounts of $672 and $240, respectively	16,844	22,124
Prepaid expenses and prepaid income taxes	11,141	10,452
Deferred contract costs	9,652	9,544
Other current assets	1,849	4,972
Restricted cash	396	250
Total current assets	216,081	218,954
Property and equipment, net	26,881	27,950
Intangible assets	10,599	3,920
Goodwill	27,623	15,207
Operating lease right-of-use assets	66,086	59,986
Restricted cash	10,627	10,553
Deferred tax assets	37,206	42,713
Deferred contract costs, net of current portion	8,825	10,514
Other non-current assets	3,508	3,826
Total assets	407,436	393,623
Current liabilities
Accounts payable	10,438	36,731
Accrued expenses, accrued income taxes and other current liabilities	12,991	18,262
Deferred revenue	8,195	9,984
Operating lease liabilities	11,523	8,781
Total current liabilities	43,147	73,758
Operating lease liabilities	65,073	60,818
Deferred tax liabilities	314	284
Other non–current liabilities	3,047	1,908
Total liabilities	111,581	136,768
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued and outstanding
Additional paid-in capital	224,418	205,234
Retained earnings	71,686	51,859
Accumulated other comprehensive loss	(362)	(350)
Total stockholders’ equity	295,855	256,855
Total liabilities and stockholders’ equity	407,436	393,623
Class A Common Stock
Stockholders’ equity:
Common stock	93	92
Class B Common Stock
Stockholders’ equity:
Common stock	$ 20	$ 20

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ 672	$ 240
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	92,862,607	91,819,649
Common stock, shares outstanding	92,862,607	91,819,649
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	19,975,155	20,314,644
Common stock, shares outstanding	19,975,155	20,314,644

Unaudited Condensed Consolidated Income Statements - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2020

Jun. 30, 2019

Jun. 30, 2020

Jun. 30, 2019

Income Statement [Abstract]

Revenue

$ 94,737

$ 145,031

$ 252,426

$ 280,301

Cost of revenue

^[1]

9,880

8,628

21,490

16,348

Gross profit

84,857

136,403

230,936

263,953

Operating expenses:

Sales and marketing

38,583

101,789

132,178

193,105

Product, technology, and development

21,887

17,346

44,971

33,318

General and administrative

14,158

12,540

30,018

24,300

Depreciation and amortization

1,520

1,180

3,041

2,247

Total operating expenses

76,148

132,855

210,208

252,970

Income from operations

8,709

3,548

20,728

10,983

Other income, net:

Interest income

317

744

879

1,488

Other income, net

157

105

323

1,007

Total other income, net

474

849

1,202

2,495

Income before income taxes

9,183

4,397

21,930

13,478

Provision for (benefit from) income taxes

2,052

(1,610)

2,103

(5,113)

Net income

$ 7,131

$ 6,007

$ 19,827

$ 18,591

Net income per share attributable to common stockholders: (Note 11)

Basic

$ 0.06

$ 0.05

$ 0.18

$ 0.17

Diluted

$ 0.06

$ 0.05

$ 0.17

$ 0.16

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

Basic

112,734,393

111,299,345

112,544,743

111,051,070

Diluted

113,737,465

113,388,509

113,947,241

113,398,793

[1]	Includes depreciation and amortization expense for the three months ended June 30, 2020 and 2019 and for the six months ended June 30, 2020 and 2019 of $1,837, $734, $3,306 and $1,294, respectively.

Unaudited Condensed Consolidated Income Statements (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Depreciation and amortization expense	$ 1,837	$ 734	$ 3,306	$ 1,294

Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 7,131	$ 6,007	$ 19,827	$ 18,591
Other comprehensive income (loss):
Foreign currency translation adjustment	481	356	(12)	(68)
Comprehensive income	$ 7,612	$ 6,363	$ 19,815	$ 18,523

- Definition

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

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+ Details

Unaudited Condensed Consolidated Statements of 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 (Loss) Income
Beginning balance at Dec. 31, 2018	$ 194,111			$ 90	$ 21	$ 184,216	$ 9,713	$ 71
Beginning balance, Shares at Dec. 31, 2018				89,728,223	20,702,084
Net income	12,584						12,584
Stock–based compensation expense	7,995					7,995
Issuance of common stock upon exercise of stock options	697					697
Issuance of common stock upon exercise of stock options, Shares				447,210
Issuance of common stock upon vesting of restricted stock units, Shares				297,374
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options	(3,954)					(3,954)
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares				(102,034)
Foreign currency translation adjustment	(424)							(424)
Ending balance at Mar. 31, 2019	211,009			$ 90	$ 21	188,954	22,297	(353)
Ending balance, Shares at Mar. 31, 2019				90,370,773	20,702,084
Beginning balance at Dec. 31, 2018	194,111			$ 90	$ 21	184,216	9,713	71
Beginning balance, Shares at Dec. 31, 2018				89,728,223	20,702,084
Net income	18,591
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares		(224,171)
Foreign currency translation adjustment	(68)
Ending balance at Jun. 30, 2019	222,386			$ 91	$ 21	193,967	28,304	3
Ending balance, Shares at Jun. 30, 2019				90,744,921	20,702,084
Beginning balance at Mar. 31, 2019	211,009			$ 90	$ 21	188,954	22,297	(353)
Beginning balance, Shares at Mar. 31, 2019				90,370,773	20,702,084
Net income	6,007						6,007
Stock–based compensation expense	9,260					9,260
Issuance of common stock upon exercise of stock options	391					391
Issuance of common stock upon exercise of stock options, Shares				133,838
Issuance of common stock upon vesting of restricted stock units				$ 1		(1)
Issuance of common stock upon vesting of restricted stock units, Shares				362,447
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options	(4,637)					(4,637)
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares		(122,137)		(122,137)
Foreign currency translation adjustment	356							356
Ending balance at Jun. 30, 2019	222,386			$ 91	$ 21	193,967	28,304	3
Ending balance, Shares at Jun. 30, 2019				90,744,921	20,702,084
Beginning balance at Dec. 31, 2019	256,855			$ 92	$ 20	205,234	51,859	(350)
Beginning balance, Shares at Dec. 31, 2019		91,819,649	20,314,644	91,819,649	20,314,644
Net income	12,696						12,696
Stock–based compensation expense	11,793					11,793
Issuance of common stock upon exercise of stock options	514					514
Issuance of common stock upon exercise of stock options, Shares				160,668
Issuance of common stock upon vesting of restricted stock units				$ 1		(1)
Issuance of common stock upon vesting of restricted stock units, Shares				308,303
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options	(3,397)					(3,397)
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares				(106,934)
Conversion of common stock, shares issued				335,741
Conversion of common stock, shares converted					(335,741)
Foreign currency translation adjustment	(493)							(493)
Ending balance at Mar. 31, 2020	277,968			$ 93	$ 20	214,143	64,555	(843)
Ending balance, Shares at Mar. 31, 2020				92,517,427	19,978,903
Beginning balance at Dec. 31, 2019	256,855			$ 92	$ 20	205,234	51,859	(350)
Beginning balance, Shares at Dec. 31, 2019		91,819,649	20,314,644	91,819,649	20,314,644
Net income	19,827
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares		(225,943)
Foreign currency translation adjustment	(12)
Ending balance at Jun. 30, 2020	295,855			$ 93	$ 20	224,418	71,686	(362)
Ending balance, Shares at Jun. 30, 2020		92,862,607	19,975,155	92,862,607	19,975,155
Beginning balance at Mar. 31, 2020	277,968			$ 93	$ 20	214,143	64,555	(843)
Beginning balance, Shares at Mar. 31, 2020				92,517,427	19,978,903
Net income	7,131						7,131
Stock–based compensation expense	12,249					12,249
Issuance of common stock upon exercise of stock options	415					415
Issuance of common stock upon exercise of stock options, Shares				84,796
Issuance of common stock upon vesting of restricted stock units, Shares				375,645
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options	(2,389)					(2,389)
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options, Shares		(119,009)		(119,009)
Conversion of common stock, shares issued				3,748
Conversion of common stock, shares converted					(3,748)
Foreign currency translation adjustment	481							481
Ending balance at Jun. 30, 2020	$ 295,855			$ 93	$ 20	$ 224,418	$ 71,686	$ (362)
Ending balance, Shares at Jun. 30, 2020		92,862,607	19,975,155	92,862,607	19,975,155

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net income	$ 19,827	$ 18,591
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,347	3,541
Currency gain on foreign denominated transactions	(91)	(840)
Deferred taxes	4,695	(5,316)
Provision for doubtful accounts	1,658	368
Stock-based compensation expense	23,375	16,629
Amortization of deferred contract costs	5,641	3,634
Changes in operating assets and liabilities:
Accounts receivable, net	5,653	(3,838)
Prepaid expenses, prepaid income taxes, and other assets	2,835	(2,071)
Deferred contract costs	(4,074)	(7,768)
Accounts payable	(25,914)	6,032
Accrued expenses, accrued income taxes, and other current liabilities	(5,294)	(1,309)
Deferred revenue	(1,788)	(332)
Lease obligations	898	(1,880)
Other non-current liabilities	1,160	288
Net cash provided by operating activities	34,928	25,729
Investing Activities
Purchases of property and equipment	(2,571)	(8,584)
Capitalization of website development costs	(1,695)	(1,527)
Cash paid for acquisition, net of cash acquired	(21,004)	(19,139)
Investments in certificates of deposit		(96,527)
Maturities of certificates of deposit	68,692	100,000
Net cash provided by (used in) investing activities	43,422	(25,777)
Financing Activities
Proceeds from exercise of stock options	929	1,088
Payment of finance lease obligations	(18)	(12)
Payment of withholding taxes on net share settlement of restricted stock units	(5,786)	(8,591)
Net cash used in financing activities	(4,875)	(7,515)
Impact of foreign currency on cash, cash equivalents, and restricted cash	24	17
Net increase (decrease) in cash, cash equivalents, and restricted cash	73,499	(7,546)
Cash, cash equivalents, and restricted cash at beginning of period	70,723	37,558
Cash, cash equivalents, and restricted cash at end of period	144,222	30,012
Supplemental disclosure of cash flow information:
Cash paid for income taxes	26	88
Unpaid purchases of property and equipment	7	2,650
Capitalized stock-based compensation expense in website development and internal-use software costs	667	626
Cash paid for operating lease liabilities	$ 6,260	$ 5,605

Organization and Business Description

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Organization and Business Description

1. Organization and Business Description

CarGurus, Inc. (the “Company”), is a global, online automotive marketplace connecting buyers and sellers of new and used cars. Using proprietary technology, search algorithms, and innovative data analytics, the Company provides information and analysis that create a differentiated automotive search experience for consumers. The Company’s marketplace empowers users worldwide with unbiased third-party validation on pricing and dealer reputation, as well as other useful information that aids them in finding “Great Deals from Top-Rated Dealers.”

The Company is headquartered in Cambridge, Massachusetts and was incorporated in the State of Delaware on June 26, 2015. The Company operates principally in the United States. In addition to the United States, it operates online marketplaces under the CarGurus brand in Canada and the United Kingdom. The Company also operated online marketplaces in Germany, Italy, and Spain until it ceased the operations of each of these marketplaces in the second quarter of 2020. In the United States and the United Kingdom, the Company also operates the Autolist and PistonHeads online marketplaces, respectively, as independent brands. The Company has subsidiaries in the United States, Canada, Ireland, and the United Kingdom. Additionally, the Company has two reportable segments, United States and International. See Note 13 of the Unaudited Condensed Consolidated Financial Statements included elsewhere in this Quarterly Report.

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying interim condensed consolidated financial statements (the “Unaudited Condensed Consolidated Financial Statements”) and related disclosures 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 the authoritative U.S. generally accepted accounting principles as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”).

The Unaudited Condensed Consolidated Financial Statements are unaudited. These Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2019 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the Securities and Exchange Commission (“SEC”) on February 14, 2020 (the “2019 Annual Report”).

The Unaudited Condensed Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the SEC. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The Unaudited Condensed Consolidated Financial Statements reflect all adjustments, consisting of only normal recurring adjustments, necessary for the fair presentation of the Company’s financial position as of June 30, 2020 and December 31, 2019, results of operations, comprehensive income, changes in shareholders’ equity for the three and six months ended June 30, 2020 and cash flows for the six months ended June 30, 2020 and 2019. These interim period results are not necessarily indicative of the results to be expected for any other interim period or the full year.

The accompanying Unaudited Condensed Consolidated Financial Statements reflect the application of certain significant accounting policies as described below and elsewhere in these notes to the Unaudited Condensed Consolidated Financial Statements. As of June 30, 2020, there have been no material changes in the Company's significant accounting policies from those that were disclosed in the 2019 Annual Report.

Principles of Consolidation

The accompanying Unaudited Condensed 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 financial statements to provide additional evidence for certain estimates or to identify matters that require additional disclosure. Subsequent events have been evaluated as required. 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 financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period.

Significant estimates relied upon in preparing these Unaudited Condensed Consolidated Financial Statements include revenue recognition, allowance for doubtful accounts and sales allowances, variable consideration, the recoverability of long-lived assets, the valuation and recoverability of goodwill and intangible assets, the expensing and capitalization of product, technology, and development costs for website development and internal‑use software, and the recoverability of the Company’s net deferred tax assets and related valuation allowance.

Although the Company regularly assesses these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in the period in which they become known. 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.

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, investments, and trade accounts receivable.

The Company maintains its cash, cash equivalents, and investments principally with accredited financial institutions of high credit standing. Although the Company deposits its cash, cash equivalents, and investments with multiple financial institutions, its deposits may often exceed governmental insured limits.

Credit risk with respect to accounts receivable is dispersed due to the large number of customers. The Company routinely assesses the creditworthiness of its customers. The Company generally has not experienced any material losses related to receivables from individual customers, or groups of customers. The Company does not require collateral. 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.

For the three and six months ended June 30, 2020 and 2019, no individual customer accounted for more than 10% of total revenue.

As of June 30, 2020, no customer accounted for more than 10% of net accounts receivable. As of December 31, 2019, one customer accounted for 18% of net accounts receivable.

Included in net accounts receivable at June 30, 2020 and December 31, 2019, are $8,414 and $8,880, respectively, of unbilled accounts receivable primarily related to advertising customers that are generally billed within a quarter subsequent to services being rendered and revenues recognized in excess of billings during the second quarter related to spreading fee reductions resulting from the COVID-19 pandemic over the remaining contract term.

Allowance for Credit Losses

The Company is exposed to credit losses primarily through its trade accounts receivable. The Company determines the required allowance for expected credit losses using information such as historical loss trends, current conditions, and reasonable and supportable forecasts of economic conditions such as the impacts of the novel strain of coronavirus that surfaced in Wuhan, China in December 2019 and was subsequently declared a pandemic by the World Health Organization (“COVID-19”). Amounts are charged against the allowance when it is determined that expected credit losses may occur.

In light of the COVID-19 pandemic, the Company assessed the implications on accounts receivable and increased its allowance for doubtful accounts to $672 as of June 30, 2020 as compared to $240 as of December 31, 2019. The increase in account delinquencies due to the COVID-19 pandemic resulted in $1,658 of bad debt expense and $1,226 of write offs, net of recoveries for the six months ended June 30, 2020.

Below is a summary of the changes in the Company’s allowance for doubtful accounts for the six months ended June 30, 2020:

Balance at

Beginning of

Period

Provision

Write–offs,

Net of

Recoveries

Balance at

End of Period

Six Months Ended June 30, 2020

240

1,658

(1,226

)

672

Revenue Recognition

The following table summarizes revenue from contracts with customers by geographical region and by revenue source for the three and six months ended June 30, 2020 and 2019.

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
United States
Marketplace subscription revenue	$	75,457	$	122,352	$	208,481	$	237,373
Advertising and other revenue		14,289		14,658		29,271		28,040
Total		89,746		137,010		237,752		265,413
International
Marketplace subscription revenue		4,496		6,744		13,338		12,566
Advertising and other revenue		495		1,277		1,336		2,322
Total		4,991		8,021		14,674		14,888
Total Revenue
Marketplace subscription revenue		79,953		129,096		221,819		249,939
Advertising and other revenue		14,784		15,935		30,607		30,362
Total	$	94,737	$	145,031	$	252,426	$	280,301

The Company provides disaggregation of revenue based on the United States versus International geographical region classification and based on the marketplace subscription versus advertising and other revenue classification as it believes these categories best depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.

ASC Topic 606, Revenue from Contracts with Customers (“Topic 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 quarter 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 June 30, 2020 was approximately $15.6 million, which the Company expects to recognize over the next 12 months.

For contracts with an original expected duration of one year or less, the Company has applied the practical expedient available under Topic 606 to not disclose the amount of transaction price allocated to unsatisfied performance obligations as of June 30, 2020. For performance obligations not satisfied as of June 30, 2020, 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 June 30, 2020. The remaining duration is less than one year.

Revenue recognized during the six months ended June 30, 2020 from amounts included in deferred revenue at the beginning of the period was approximately $9,984.

On March 18, 2020, in response to the COVID-19 pandemic, the Company announced a 50% fee reduction on all marketplace subscriptions for the April service period for paying dealers in the United States, Canada and the United Kingdom as well as a 100% fee reduction for paying dealers in Italy. On April 16, 2020, the Company announced a 50% fee reduction on all May marketplace subscriptions for paying dealers in the United States, Canada and the United Kingdom and suspension of all charges for paying dealers in Italy as the Company ceased the operations of its Italian marketplace in May 2020. On April 29, 2020, the Company announced a 20% and 50% fee reduction on all June marketplace subscriptions for paying dealers in the United States and United Kingdom, respectively. On May 5, 2020, the Company also announced a 20% fee reduction on all June marketplace subscriptions for paying dealers in Canada. These fee reductions resulted in a modification to contracts with initial contractual periods greater than one month. For any contract modified, the Company calculated the remaining transaction price and allocated the consideration over the remaining performance obligations.

Recent Accounting Pronouncements Adopted

Goodwill and Intangibles

In January 2017, the FASB issued ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). ASU 2017-04 simplifies the accounting for goodwill impairment by eliminating Step 2 of the goodwill impairment test. Under previous guidance, Step 2 of the goodwill impairment test required entities to calculate the implied fair value of goodwill in the same manner as the amount of goodwill recognized in a business combination by assigning the fair value of a reporting unit to all of the assets and liabilities of the reporting unit. The carrying value in excess of the implied fair value was recognized as goodwill impairment. Under ASU 2017-04, goodwill impairment is recognized based on Step 1 of the goodwill impairment test, which calculates the carrying value in excess of the reporting unit’s fair value. The standard was effective beginning in January 2020, with early adoption permitted. The Company adopted the guidance on January 1, 2020 and applied it on a prospective basis. The adoption did not have a material impact on the Unaudited Condensed Consolidated Financial Statements.

Credit Losses

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 and its subsequent related updates establish a forward-looking “expected loss model” that requires entities to estimate current expected credit losses on accounts receivable and financial instruments by using all practical and relevant information. ASU 2016-13 and its subsequent related updates were effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. The Company adopted the guidance on January 1, 2020 and applied it on a prospective basis. The adoption did not have a material impact on the Unaudited Condensed Consolidated Financial Statements.

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.

Income Taxes

In December 2019, the FASB issued ASU 2019-12, Income Taxes – Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by removing several exceptions in the current standard and adding guidance to reduce complexity in certain areas, such as requiring that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company is currently assessing the impact that adopting this guidance will have on its Unaudited Condensed Consolidated Financial Statements.

Acquisitions

6 Months Ended

Jun. 30, 2020

Business Combinations [Abstract]

Acquisitions

3. Acquisitions

On January 16, 2020, the Company acquired Autolist, an automotive shopping platform based in San Francisco, California, pursuant to an Agreement and Plan of Merger by and among the Company, Alpine Merger Sub, Inc., a Delaware corporation and wholly-owned subsidiary of the Company (“Merger Sub”), Auto List, Inc., a Delaware corporation (“Target”), and the securityholders’ representative therein, pursuant to which, among other things, the Company acquired Target through the merger of Merger Sub with and into Target (the “Merger”), with Target surviving as a wholly owned subsidiary of the Company. The Company paid an aggregate of $21.0 million, net of cash acquired, to consummate the Merger. The amount paid includes $2.2 million that is held in escrow to secure post-closing claims. The Merger is intended to both expand the Company’s consumer audience in the United States and enhance its value proposition for subscribing dealers.

As of June 30, 2020, the Company incurred total acquisition-related costs of $1.4 million related to the Merger. For the three months ended June 30, 2020, the Company incurred immaterial acquisition-related costs and for the six months ended June 30, 2020, the Company incurred total acquisition-related costs of $1.0 million. Acquisition-related costs were excluded from the purchase price allocation as they were primarily comprised of one-time severance and bonus related expenses. For the six months ended June 30, 2020, $0.5 million, $0.3 million and $0.2 million of acquisition-related costs were recorded as operating expense and allocated to product, technology, and development, general and administrative, and sales and marketing, respectively, within the Unaudited Condensed Consolidated Income Statement.

The acquisition has been accounted for as a business combination under the acquisition method and, accordingly, the total purchase price is allocated to the acquired assets and assumed liabilities. The following table presents the preliminary purchase price allocation recorded in the Company’s Unaudited Condensed Consolidated Balance Sheet as of the acquisition date, which is subject to finalization for estimates of the fair value of assets acquired and liabilities assumed as of the acquisition date, including, but not limited to tangible assets, intangible assets and tax-related items, and the related tax and effects of any changes made:

	Estimated Fair Value at Date of Acquisition
Cash and cash equivalents	$	50
Restricted cash		220
Accounts receivable		2,034
Intangible assets ⁽¹⁾		7,600
Goodwill ⁽²⁾		12,409
Operating lease right-of-use assets		2,169
Other assets, net		162
Accounts payable and accrued expenses		(358	)
Operating lease liabilities - current		(446	)
Operating lease liabilities - non-current		(1,723	)
Deferred tax liabilities ⁽³⁾		(843	)
Total purchase price	$	21,274

(1)

Identifiable definite-lived intangible assets were comprised of brand, developed technology, and customer relationships of $5,600, $1,200 and $800, respectively, with estimated useful lives of 9 years, 3 years and 3 years, respectively, which will be amortized on a straight-line basis over their estimated useful lives. The fair value of the brand has been estimated using the multi-period excess earnings method which is a variation of the income approach. The fair value of the development technology and customer relationships has been estimated using a cost approach, which assesses the cost to redevelop the app and technology, and relationships, respectively.

(2)

The goodwill represents the excess value of the purchase price over net assets acquired. The goodwill in this transaction is primarily attributable to expected consumer traffic growth and shopper connections for dealers across both the CarGurus and Autolist websites, creating additional value for the Company’s premium subscription customers. All goodwill is assigned to the United States reporting segment. The acquisition of Autolist is treated as a stock acquisition for tax purposes and goodwill is not deductible for tax purposes.

(3)

The estimated deferred tax liability corresponds to the acquired intangible assets which have no tax basis. As a result of the estimated deferred tax liability, an adjustment was recorded to goodwill to account for the tax effect of the estimated deferred tax liability.

Actual and pro forma results for this acquisition have not been presented as the financial impact to the Company’s Unaudited Condensed Consolidated Financial Statements is not material.

Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments

4. Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments

The following tables present, for each of the fair value levels, the Company’s assets that are measured at fair value on a recurring basis at June 30, 2020 and at December 31, 2019:

	At June 30, 2020
	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:
Money market funds	$	98,921	$	—	$	—	$	98,921
Investments:
Certificates of deposit		—		43,000		—		43,000
Total	$	98,921	$	43,000	$	—	$	141,921

	At December 31, 2019
	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:
Money market funds	$	29,196	$	—	$	—	$	29,196
Investments:
Certificates of deposit		—		111,692		—		111,692
Total	$	29,196	$	111,692	$	—	$	140,888

Certificates of deposit at June 30, 2020 and December 31, 2019 had maturity dates of one year or less.

The Company measures eligible assets and liabilities at fair value with changes in value recognized in earnings. There were no liabilities that were measured at fair value as of June 30, 2020 and December 31, 2019. 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. 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 during the six months ended June 30, 2020 or the year ended December 31, 2019.

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 one year or less 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.

Cash and cash equivalents primarily consist of cash on deposit with banks and amounts held in interest-bearing money market accounts. Cash equivalents are carried at cost, which approximates their fair market value.

The following is a summary of investments as of June 30, 2020 and December 31, 2019:

	At June 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Investments:
Certificates of deposit due in one year or less	$	43,000	$	—	$	—	$	43,000
Total investments	$	43,000	$	—	$	—	$	43,000

	At December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Investments:
Certificates of deposit due in one year or less	$	111,692	$	—	$	—	$	111,692
Total investments	$	111,692	$	—	$	—	$	111,692

Property and Equipment, Net

6 Months Ended

Jun. 30, 2020

Property Plant And Equipment [Abstract]

Property and Equipment, Net

5. Property and Equipment, Net

Property and equipment consists of the following:

	At June 30, 2020			At December 31, 2019
Computer equipment	$	8,078		$	7,923
Capitalized software		181			181
Capitalized website development costs		13,445			11,083
Furniture and fixtures		7,309			6,809
Leasehold improvements		20,471			19,507
Construction in progress		768			524
Finance lease right-of-use assets		60			78
		50,312			46,105
Less accumulated depreciation and amortization		(23,431	)		(18,155	)
Property and equipment, net	$	26,881		$	27,950

Depreciation and amortization expense, excluding amortization of intangible assets, was $2,872, $1,750, $5,430 and $3,222 for the three months ended June 30, 2020 and 2019 and the six months ended June 30, 2020 and 2019, respectively.

Goodwill and Other Intangible Assets

6 Months Ended

Jun. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

6. Goodwill and Other Intangible Assets

Goodwill

The changes in the carrying value of goodwill were as follows:

Balance at December 31, 2019	$	15,207
Autolist acquisition		12,409
Foreign currency translation adjustment		7
Balance at June 30, 2020	$	27,623

The Company tests goodwill for impairment at least annually or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. As a result of the COVID-19 pandemic, the Company assessed its goodwill for impairment concluding that there was no impairment as of June 30, 2020.

Other Intangible Assets

Intangible assets as of June 30, 2020 and December 31, 2019 consist of the following:

	At June 30, 2020
	Weighted Average Remaining Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Brand		8.9	$	9,123	$	756	$	8,367
Customer relationships		2.1		1,842		626		1,216
Developed technology		2.5		1,200		184		1,016
Total			$	12,165	$	1,566	$	10,599

	At December 31, 2019
	Weighted Average Remaining Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Brand		10.0	$	3,524	$	313	$	3,211
Customer relationships		2.0		1,045		336		709
Total			$	4,569	$	649	$	3,920

The Company recorded amortization expense related to intangible assets of $485, $164, $917 and $319 for the three months ended June 30, 2020 and 2019 and the six months ended June 30, 2020, and 2019, respectively.

The estimated useful life of the PistonHeads brand and customer relationships is 11 years and 3 years, respectively. The estimated useful life of the Autolist brand, customer relationships and developed technology is 9 years, 3 years and 3 years, respectively. The Company evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets. As a result of the COVID-19 pandemic, the Company assessed its long-lived assets for impairment and concluded that there was no impairment as of June 30, 2020.

Estimated amortization expense of intangible assets for future periods as of June 30, 2020 is as follows:

Year Ending December 31,	Amortization Expense
Remainder of 2020	$	959
2021		1,918
2022		1,683
2023		958
2024		939
2025		939
Thereafter		3,203
Total	$	10,599

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities

6 Months Ended

Jun. 30, 2020

Accrued Liabilities Current [Abstract]

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities

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

Accrued expenses, accrued income taxes and other current liabilities consist of the following:

	At June 30, 2020		At December 31, 2019
Accrued bonus	$	4,104	$	8,637
Other accrued expenses, accrued income taxes and other current liabilities		8,887		9,625
Total	$	12,991	$	18,262

The decrease of $4,533 in the accrued bonus balance is primarily due to the payout of the fiscal year 2019 bonus in the first quarter of 2020 as well as a lower overall estimated bonus payout for fiscal year 2020.

Restructuring

6 Months Ended

Jun. 30, 2020

Restructuring And Related Activities [Abstract]

Restructuring

8. Restructuring

On April 13, 2020, the Board of Directors of the Company approved an expense reduction plan to address the impact of the COVID-19 pandemic on the Company’s business (the “Expense Reduction Plan”), pursuant to which the Company initiated a reduction in its workforce of approximately 13%, ceased operation of its Germany, Italy and Spain marketplaces, and halted expansion efforts in any new international markets. The Expense Reduction Plan was completed in the second quarter of 2020.

The Expense Reduction Plan was completed in the second quarter of 2020 and during such quarter resulted in restructuring charges of $3,248 for employee severance and related benefits expense and $1,019 for write-off of capitalized website development costs and deferred contract costs from international marketplaces.

The following table summarizes restructuring accrual activity for employee severance and related benefits expense for the three months ended June 30, 2020:

	Employee Severance and Related Benefits
Balance, April 1, 2020	$	—
Charges		3,248
Cash disbursements		(2,387	)
Noncash settlements		(667	)
Balance, June 30, 2020	$	194

For the three months ended June 30, 2020, $2,160, $737, $207 and $144 of employee severance and related benefits expense was recorded as sales and marketing, product, technology, and development, cost of revenue, and general and administrative, respectively, within the Unaudited Condensed Consolidated Income Statement. All of the accrued employee severance and related benefits as of June 30, 2020 are expected to be paid within the next 12 months and were recorded within accrued expenses, accrued income taxes and other current liabilities on the Unaudited Condensed Consolidated Balance Sheets. For the six months ended June 30, 2020, $667 of employee severance and related benefits expense was recorded as stock-based compensation expense within the Unaudited Condensed Consolidated Statements of Cash Flows.

During the three months ended June 30, 2020, the Company recognized $1,019 for write-off of capitalized website development costs and deferred contract costs from international marketplaces. For the three months ended June 30, 2020, $844 and $175 of the write-off of capitalized website development costs and deferred contract costs from international marketplaces were recorded as cost of revenue and sales and marketing, respectively, within the Unaudited Condensed Consolidated Income Statement. For the six months ended June 30, 2020, $844 of the write-off of capitalized website development costs from international marketplaces were recorded as depreciation and amortization within the Unaudited Condensed Consolidated Statements of Cash Flows.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

9. Commitments and Contingencies

Contractual Obligations and Commitments

All of the Company’s property, equipment, and internal-use software have been purchased with cash with the exception of amounts related to unpaid property and equipment as disclosed in the Unaudited Condensed Consolidated Statements of Cash Flows and immaterial amounts related to obligations under one finance lease as of June 30, 2020. The Company has no material long-term purchase obligations outstanding with any vendor or third party.

Leases

The Company's operating lease obligations consist of various leases for office space in: Boston, Massachusetts; Cambridge, Massachusetts; Detroit, Michigan; San Francisco, California; Austin Texas; Dublin, Ireland; and London, United Kingdom. The

Company terminated its leases in Los Angeles, California and New York City, New York during the second quarter of 2020. The Company also has an operating lease obligation for data center space in Needham, Massachusetts.

As of June 30, 2020, there were no material changes in the Company’s leases from those disclosed in the 2019 Annual Report, other than as discussed below.

On June 12, 2020, the Company amended its operating lease agreement in Boston, Massachusetts at 1001 Boylston Street, which was originally entered into on December 19, 2019. Pursuant to this amendment, the Company exercised its right to reduce the amount of office space agreed to under the lease to 225,428 square feet, and the parties agreed to certain other changes to the lease as set forth in the amendment. As the lease has been signed but the lease term has not commenced, there is no impact to the Unaudited Condensed Consolidated Financial Statements.

On January 10, 2019, Auto List, Inc., which the Company acquired on January 16, 2020, entered into an operating lease in San Francisco, California at 332 Pine St. for the lease of 6,345 square feet of office space with a non-cancellable lease term through 2024. The lease provides for annual rent increases through the term of the lease.

The Company’s leases in Boston, Massachusetts, Cambridge, Massachusetts and San Francisco, California have associated letters of credit, which are recorded as restricted cash within the Unaudited Condensed Consolidated Balance Sheet. At June 30, 2020 and December 31, 2019, restricted cash was $11,023 and $10,803, respectively, 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. At June 30, 2020 and December 31, 2019, portions of restricted cash were classified as a short-term asset and long‑term asset, as disclosed on the Unaudited Condensed Consolidated Balance Sheet. Additionally, the Company’s lease agreement for 121 First St. in Cambridge, Massachusetts has an associated security deposit, which is recorded in
other non-current assets within the Unaudited Condensed Consolidated Balance Sheet.

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 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.

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, indemnification, and other common provisions. The Company does not, in the ordinary course, agree to guaranty or indemnification obligations for the Company under its contracts with customers. Based on historical experience and information known at June 30, 2020 and December 31, 2019, the Company has not incurred any costs for guarantees or indemnities.

Stock-based Compensation

6 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation

10. Stock-based Compensation

The following two tables show stock compensation expense by award type and where the stock compensation expense is recorded in the Company’s Unaudited Condensed Consolidated Income Statements:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Options	$	3	$	44	$	17	$	95
Restricted stock units		11,920		8,899		23,587		16,534
Total stock-based compensation expense	$	11,923	$	8,943	$	23,604	$	16,629

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cost of revenue	$	85	$	95	$	184	$	176
Sales and marketing expense		3,064		2,560		5,756		4,872
Product, technology, and development expense		5,316		3,997		10,721		7,180
General and administrative expense		3,458		2,291		6,943		4,401
Total stock-based compensation expense	$	11,923	$	8,943	$	23,604	$	16,629

Excluded from stock-based compensation expense is $419, $317, $667, and $626 of capitalized website development and internal-use software costs for the three months ended June 30, 2020 and 2019 and the six months ended June 30, 2020, and 2019, respectively.

During the three months ended June 30, 2020 and 2019 and the six months ended June 30, 2020 and 2019, the Company withheld 119,009, 122,137, 225,943, and 224,171 shares of Class A common stock, respectively, to satisfy employee tax withholding requirements due to net share settlements. The shares withheld return to the authorized, but unissued pool under the Company’s Omnibus Equity Compensation Plan and can be reissued by the Company. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements were $2,389, $4,637, $5,786 and $8,591 for the three months ended June 30, 2020 and 2019 and the six months ended June 30, 2020, and 2019, respectively, and are reflected as a financing activity within the Unaudited Condensed Consolidated Statements of Cash Flows.

Earnings Per Share

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Earnings Per Share

11. Earnings Per Share

Net income per share for the three and six months ended June 30, 2020 and 2019 is computed by dividing net income 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 end reporting period plus the weighted-average of any additional shares issued and outstanding during the reporting period.

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 on either the death or voluntary termination of the Company’s Chief Executive Officer. The Company allocates undistributed earnings attributable to common stock between the common stock classes on a one‑to‑one basis when computing net income per share. As a result, basic and diluted net income per share of Class A common stock and per share of Class B common stock are equivalent.

During the three months ended June 30, 2020, holders of Class B common stock converted 3,748 shares of Class B common stock to Class A common stock. During the three months ended June 30, 2019, no holders of Class B common stock converted shares of Class B common stock to Class A common stock. During the six months ended June 30, 2020, holders of Class B common stock converted 339,489 shares of Class B common stock to Class A common stock. During the six months ended June 30, 2019, no holders of Class B common stock converted shares of Class B common stock to Class A common stock.

Diluted net income per share gives effect to all potentially dilutive securities. Potential dilutive securities for the three and six months ended June 30, 2020 and 2019 consist of shares of common stock issuable upon the exercise of stock options and shares of common stock issuable upon the vesting of restricted stock units (“RSUs”). The dilutive effect of these common stock equivalents is reflected in diluted earnings per share by application of the treasury stock method.

For the three and six months ended June 30, 2020 and 2019, diluted net income per share was calculated by dividing net income by the weighted-average number of shares of common stock outstanding during the period plus the dilutive impact of stock options and shares of common stock issuable upon the vesting of RSUs.

The following table presents a reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Numerator:
Net income	$	7,131	$	6,007	$	19,827	$	18,591
Denominator:
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders — basic		112,734,393		111,299,345		112,544,743		111,051,070
Dilutive effect of share equivalents resulting from stock options		674,063		1,195,429		735,474		1,322,752
Dilutive effect of share equivalents resulting from unvested restricted stock units		329,009		893,735		667,024		1,024,971
Weighted-average number of shares of common stock used in computing net income per share — diluted		113,737,465		113,388,509		113,947,241		113,398,793
Net income per share attributable to common stockholders:
Basic	$	0.06	$	0.05	$	0.18	$	0.17
Diluted	$	0.06	$	0.05	$	0.17	$	0.16

The following potentially dilutive common stock equivalents have been excluded from the calculation of diluted weighted-average shares outstanding for the three and six months ended June 30, 2020 and 2019, as their effect would have been anti-dilutive for the periods presented:

Three Months Ended

June 30,

Six Months Ended

June 30,

2020

2019

2020

2019

Restricted stock units outstanding

3,277,151

1,293,969

3,051,380

1,076,193

Income Taxes

6 Months Ended

Jun. 30, 2020

Income Tax Disclosure [Abstract]

Income Taxes

12. Income Taxes

During the three months ended June 30, 2020, the Company recorded income tax expense of $2,052, representing an effective tax rate of 22.3%. The effective tax rate for the three months ended June 30, 2020 was higher than the statutory tax rate of 21% principally due to permanent non-deductible expenses and shortfalls on the taxable compensation of share-based awards, partially offset by federal and state research and development tax credits.

During the six months ended June 30, 2020, the Company recorded an income tax provision of $2,103 representing an effective tax rate of 9.6%. The effective tax rate for the six months ended June 30, 2020 was lower than the statutory tax rate of 21% principally due to a discrete benefit recognized as a result of the enactment of the CARES Act (as defined below), excess stock deductions from the taxable compensation of stock-based awards and federal and state research and development tax credits, partially offset by state and local income taxes.

During the three months ended June 30, 2019, the Company recorded income tax benefit of $1,610, representing an effective tax rate of (36.6)%. The effective tax rate for the three months ended June 30, 2019 was lower than the statutory tax rate of 21% principally due to excess stock deductions from the taxable compensation of share-based awards and federal and state research and development tax credits, partially offset by state and local income taxes.

During the six months ended June 30, 2019, the Company recorded an income tax benefit of $5,113, representing an effective tax rate of (37.9)%. The effective tax rate for the six months ended June 30, 2019 was lower than the statutory tax rate of 21% principally due to the excess stock deductions from the taxable compensation of stock-based awards and federal and state research and development tax credits, partially offset by state and local income taxes.

The Company and its subsidiaries are subject to various U.S. federal, state, and foreign income taxes. The Company is currently open to examination by the Internal Revenue Service and state jurisdictions for the tax years of 2016 and after. The Company is currently open to examination in its foreign jurisdictions for tax years 2017 and after. In 2019, the Internal Revenue Service commenced a federal employment tax audit with respect to the 2016, 2017 and 2018 calendar years, which is still open. In July 2020, the Internal Revenue Service commenced a corporate income tax audit with respect to the 2017 calendar year, which is still open.

On March 27, 2020, the United States enacted the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). Among other things, the CARES Act includes a net operating loss (“NOL”) carryback provision allowing for NOLs from the 2018, 2019 and 2020 tax years to be used to offset taxable income for the tax years from 2013 to 2017. The Company has filed a carryback claim, which will reduce its current gross NOL balance by approximately $18,723 and increase its deferred federal research and development credit by approximately $2,645. The Company does not expect this election to negatively impact its analysis on the valuation allowance for its NOLs or deferred federal research and development credit.

The CARES Act also updates the Tax Cuts and Jobs Act of 2017, allowing for the depreciation of leasehold improvements over 15 years, rather than 39 years, and eligibility for bonus depreciation, rather than non-eligibility for bonus depreciation. The Company has made an estimate for the impact as it relates to the 2019 tax year and will file its 2019 return in accordance with the updated guidance in the CARES Act.

The CARES Act includes other provisions that may be utilized if the Company meets the eligibility requirements. Although the Company continues to review and evaluate the potential impact and benefit of the CARES Act on its entire business, the Company has primarily focused its review on two provisions that affect both income taxes and non-income taxes. First, the CARES Act temporarily removes the 80% limitation on NOLs to offset taxable income for tax years prior to 2021. Second, the CARES Act allows for the deferral of the employer portion of the Social Security Tax for up to two years, with half due by December 31, 2021 and the remainder due by December 31, 2022.

- 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 + Details

Segment and Geographic Information

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Segment and Geographic Information

13. Segment and Geographic Information

The Company has two reportable segments, United States and International. Segment information is presented in the same manner as the Company’s chief operating decision maker (the “CODM”) reviews the Company’s operating results in assessing performance and allocating resources. The CODM reviews revenue and operating income (loss) for each reportable segment as a proxy for the operating performance of the Company’s United States and International operations. The Company’s Chief Executive Officer is the CODM on behalf of both reportable segments.

The United States segment derives revenues from marketplace subscriptions, advertising services, and other revenues from customers within the United States. The International segment derives revenues from marketplace subscriptions, advertising services, and other revenues from customers outside of the United States. A majority of the Company’s operational overhead expenses, including technology and personnel costs, and other general and administrative costs associated with running the Company’s business, are incurred in the United States and not allocated to the International segment. Assets and costs discretely incurred by reportable segments, including depreciation and amortization, are included in the calculation of reportable segment income (loss) from operations. Segment operating income (loss) does not reflect the transfer pricing adjustments related to the Company’s foreign subsidiaries, which are recorded for statutory reporting purposes. Asset information is assessed and reviewed on a global basis.

Information regarding the Company’s operations by segment and geographical area is presented as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Segment revenue:
United States	$	89,746	$	137,010	$	237,752	$	265,413
International		4,991		8,021		14,674		14,888
Total revenue	$	94,737	$	145,031	$	252,426	$	280,301

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Segment income (loss) from operations:
United States	$	15,337		$	14,119		$	35,599		$	31,500
International		(6,628	)		(10,571	)		(14,871	)		(20,517	)
Total income from operations	$	8,709		$	3,548		$	20,728		$	10,983

As of June 30, 2020, total assets held outside of the United States were $27,918, primarily attributable to $15,214 of goodwill and $3,592 of intangible assets. As of December 31, 2019, total assets held outside of the United States were $32,528, primarily attributable to $15,207 of goodwill and $3,920 of intangible assets. The Company ceased the operations of the International segment online marketplaces in Germany, Italy, and Spain in the second quarter of 2020.

For the three months ended June 30, 2020, employee severance and related benefits expense attributable to the United States and International segments were $2,492 and $756, respectively. For the three months ended June 30, 2020, the entirety of the write-off of capitalized website development costs and deferred contract costs from international marketplaces was attributable to the International segment.

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 32
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 10: 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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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/topic&trid=2134510

+ Details

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Basis of Presentation

Principles of Consolidation

Subsequent Event Considerations

Use of Estimates

Concentration of Credit Risk

For the three and six months ended June 30, 2020 and 2019, no individual customer accounted for more than 10% of total revenue.

As of June 30, 2020, no customer accounted for more than 10% of net accounts receivable. As of December 31, 2019, one customer accounted for 18% of net accounts receivable.

Allowance for Credit Losses

Below is a summary of the changes in the Company’s allowance for doubtful accounts for the six months ended June 30, 2020:

Balance at

Beginning of

Period

Provision

Write–offs,

Net of

Recoveries

Balance at

End of Period

Six Months Ended June 30, 2020

240

1,658

(1,226

)

672

Revenue Recognition

The following table summarizes revenue from contracts with customers by geographical region and by revenue source for the three and six months ended June 30, 2020 and 2019.

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
United States
Marketplace subscription revenue	$	75,457	$	122,352	$	208,481	$	237,373
Advertising and other revenue		14,289		14,658		29,271		28,040
Total		89,746		137,010		237,752		265,413
International
Marketplace subscription revenue		4,496		6,744		13,338		12,566
Advertising and other revenue		495		1,277		1,336		2,322
Total		4,991		8,021		14,674		14,888
Total Revenue
Marketplace subscription revenue		79,953		129,096		221,819		249,939
Advertising and other revenue		14,784		15,935		30,607		30,362
Total	$	94,737	$	145,031	$	252,426	$	280,301

Revenue recognized during the six months ended June 30, 2020 from amounts included in deferred revenue at the beginning of the period was approximately $9,984.

Recent Accounting Pronouncements Adopted

Goodwill and Intangibles

Credit Losses

Goodwill and Intangibles

The Company evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets. As a result of the COVID-19 pandemic, the Company assessed its long-lived assets for impairment and concluded that there was no impairment as of June 30, 2020.

Credit Losses

Recent Accounting Pronouncements not Yet Adopted

Recent Accounting Pronouncements Not Yet Adopted

Income Taxes

Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments

Earnings Per Share

Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Summary of Changes in Allowance for Doubtful Accounts

Below is a summary of the changes in the Company’s allowance for doubtful accounts for the six months ended June 30, 2020:

Balance at

Beginning of

Period

Provision

Write–offs,

Net of

Recoveries

Balance at

End of Period

Six Months Ended June 30, 2020

240

1,658

(1,226

)

672

Summary of Revenue from Contracts with Customers by Geographical Region and by Revenue

The following table summarizes revenue from contracts with customers by geographical region and by revenue source for the three and six months ended June 30, 2020 and 2019.

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
United States
Marketplace subscription revenue	$	75,457	$	122,352	$	208,481	$	237,373
Advertising and other revenue		14,289		14,658		29,271		28,040
Total		89,746		137,010		237,752		265,413
International
Marketplace subscription revenue		4,496		6,744		13,338		12,566
Advertising and other revenue		495		1,277		1,336		2,322
Total		4,991		8,021		14,674		14,888
Total Revenue
Marketplace subscription revenue		79,953		129,096		221,819		249,939
Advertising and other revenue		14,784		15,935		30,607		30,362
Total	$	94,737	$	145,031	$	252,426	$	280,301

Acquisitions (Tables)

6 Months Ended

Jun. 30, 2020

Business Combinations [Abstract]

Summary of Preliminary Purchase Price Allocation

The following table presents the preliminary purchase price allocation recorded in the Company’s Unaudited Condensed Consolidated Balance Sheet as of the acquisition date, which is subject to finalization for estimates of the fair value of assets acquired and liabilities assumed as of the acquisition date, including, but not limited to tangible assets, intangible assets and tax-related items, and the related tax and effects of any changes made:

	Estimated Fair Value at Date of Acquisition
Cash and cash equivalents	$	50
Restricted cash		220
Accounts receivable		2,034
Intangible assets ⁽¹⁾		7,600
Goodwill ⁽²⁾		12,409
Operating lease right-of-use assets		2,169
Other assets, net		162
Accounts payable and accrued expenses		(358	)
Operating lease liabilities - current		(446	)
Operating lease liabilities - non-current		(1,723	)
Deferred tax liabilities ⁽³⁾		(843	)
Total purchase price	$	21,274

(1)

(2)

(3)

Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

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

The following tables present, for each of the fair value levels, the Company’s assets that are measured at fair value on a recurring basis at June 30, 2020 and at December 31, 2019:

	At June 30, 2020
	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:
Money market funds	$	98,921	$	—	$	—	$	98,921
Investments:
Certificates of deposit		—		43,000		—		43,000
Total	$	98,921	$	43,000	$	—	$	141,921

	At December 31, 2019
	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:
Money market funds	$	29,196	$	—	$	—	$	29,196
Investments:
Certificates of deposit		—		111,692		—		111,692
Total	$	29,196	$	111,692	$	—	$	140,888

Schedule of Investments

The following is a summary of investments as of June 30, 2020 and December 31, 2019:

	At June 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Investments:
Certificates of deposit due in one year or less	$	43,000	$	—	$	—	$	43,000
Total investments	$	43,000	$	—	$	—	$	43,000

	At December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Investments:
Certificates of deposit due in one year or less	$	111,692	$	—	$	—	$	111,692
Total investments	$	111,692	$	—	$	—	$	111,692

Property and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2020

Property Plant And Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment consists of the following:

	At June 30, 2020			At December 31, 2019
Computer equipment	$	8,078		$	7,923
Capitalized software		181			181
Capitalized website development costs		13,445			11,083
Furniture and fixtures		7,309			6,809
Leasehold improvements		20,471			19,507
Construction in progress		768			524
Finance lease right-of-use assets		60			78
		50,312			46,105
Less accumulated depreciation and amortization		(23,431	)		(18,155	)
Property and equipment, net	$	26,881		$	27,950

Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Changes in Carrying Value of Goodwill

The changes in the carrying value of goodwill were as follows:

Balance at December 31, 2019	$	15,207
Autolist acquisition		12,409
Foreign currency translation adjustment		7
Balance at June 30, 2020	$	27,623

Summary of Other Intangible Assets

Intangible assets as of June 30, 2020 and December 31, 2019 consist of the following:

	At June 30, 2020
	Weighted Average Remaining Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Brand		8.9	$	9,123	$	756	$	8,367
Customer relationships		2.1		1,842		626		1,216
Developed technology		2.5		1,200		184		1,016
Total			$	12,165	$	1,566	$	10,599

	At December 31, 2019
	Weighted Average Remaining Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Brand		10.0	$	3,524	$	313	$	3,211
Customer relationships		2.0		1,045		336		709
Total			$	4,569	$	649	$	3,920

Summary of Estimated Amortization Expense of Intangible Assets

Estimated amortization expense of intangible assets for future periods as of June 30, 2020 is as follows:

Year Ending December 31,	Amortization Expense
Remainder of 2020	$	959
2021		1,918
2022		1,683
2023		958
2024		939
2025		939
Thereafter		3,203
Total	$	10,599

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

6 Months Ended

Jun. 30, 2020

Accrued Liabilities Current [Abstract]

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

Accrued expenses, accrued income taxes and other current liabilities consist of the following:

	At June 30, 2020		At December 31, 2019
Accrued bonus	$	4,104	$	8,637
Other accrued expenses, accrued income taxes and other current liabilities		8,887		9,625
Total	$	12,991	$	18,262

Restructuring (Tables)

6 Months Ended

Jun. 30, 2020

Restructuring And Related Activities [Abstract]

Summary of Restructuring Accrual Activity for Employee Severance and Related Benefits Expense

The following table summarizes restructuring accrual activity for employee severance and related benefits expense for the three months ended June 30, 2020:

	Employee Severance and Related Benefits
Balance, April 1, 2020	$	—
Charges		3,248
Cash disbursements		(2,387	)
Noncash settlements		(667	)
Balance, June 30, 2020	$	194

Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-based Compensation Expense by Award Type

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Options	$	3	$	44	$	17	$	95
Restricted stock units		11,920		8,899		23,587		16,534
Total stock-based compensation expense	$	11,923	$	8,943	$	23,604	$	16,629

Summary of Allocation of Stock-based Compensation Expense

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cost of revenue	$	85	$	95	$	184	$	176
Sales and marketing expense		3,064		2,560		5,756		4,872
Product, technology, and development expense		5,316		3,997		10,721		7,180
General and administrative expense		3,458		2,291		6,943		4,401
Total stock-based compensation expense	$	11,923	$	8,943	$	23,604	$	16,629

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

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

The following table presents a reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Numerator:
Net income	$	7,131	$	6,007	$	19,827	$	18,591
Denominator:
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders — basic		112,734,393		111,299,345		112,544,743		111,051,070
Dilutive effect of share equivalents resulting from stock options		674,063		1,195,429		735,474		1,322,752
Dilutive effect of share equivalents resulting from unvested restricted stock units		329,009		893,735		667,024		1,024,971
Weighted-average number of shares of common stock used in computing net income per share — diluted		113,737,465		113,388,509		113,947,241		113,398,793
Net income per share attributable to common stockholders:
Basic	$	0.06	$	0.05	$	0.18	$	0.17
Diluted	$	0.06	$	0.05	$	0.17	$	0.16

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

Three Months Ended

June 30,

Six Months Ended

June 30,

2020

2019

2020

2019

Restricted stock units outstanding

3,277,151

1,293,969

3,051,380

1,076,193

Segment and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Summary of Operations by Segment and Geographical Area

Information regarding the Company’s operations by segment and geographical area is presented as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Segment revenue:
United States	$	89,746	$	137,010	$	237,752	$	265,413
International		4,991		8,021		14,674		14,888
Total revenue	$	94,737	$	145,031	$	252,426	$	280,301

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Segment income (loss) from operations:
United States	$	15,337		$	14,119		$	35,599		$	31,500
International		(6,628	)		(10,571	)		(14,871	)		(20,517	)
Total income from operations	$	8,709		$	3,548		$	20,728		$	10,983

Organization and Business Description - Additional Information (Details)	6 Months Ended
	Jun. 30, 2020 Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
State of incorporation	DE
Date of incorporation	Jun. 26, 2015
Number of reportable segments	2

Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands					3 Months Ended		6 Months Ended		12 Months Ended
	May 05, 2020	Apr. 29, 2020	Apr. 16, 2020	Mar. 18, 2020	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019 Customer	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019 USD ($) Customer	Dec. 31, 2019 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
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.
Allowance for doubtful accounts					$ 672		$ 672		$ 240
Bad debt expense							1,658	$ 368
Allowance for doubtful accounts write offs, net							1,226
Performance obligation unsatisfied					$ 15,600		15,600
Revenue recognized							$ 9,984
United States
Summary Of Significant Accounting Policies [Line Items]
Percentage fee reduction on marketplace subscription services		20.00%	50.00%	50.00%
Canada
Summary Of Significant Accounting Policies [Line Items]
Percentage fee reduction on marketplace subscription services	20.00%		50.00%	50.00%
United Kingdom
Summary Of Significant Accounting Policies [Line Items]
Percentage fee reduction on marketplace subscription services		50.00%	50.00%	50.00%
Italy
Summary Of Significant Accounting Policies [Line Items]
Percentage fee reduction on marketplace subscription services				100.00%
Sales Revenue, Net \| Concentration of Credit Risk
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, percentage					10.00%	10.00%	10.00%	10.00%
Number of major customers \| Customer					0	0	0	0
Net Accounts Receivable \| Advertising Customers
Summary Of Significant Accounting Policies [Line Items]
Unbilled accounts receivable					$ 8,414		$ 8,414		$ 8,880
Net Accounts Receivable \| Concentration of Credit Risk
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, percentage							10.00%
Number of major customers \| Customer							0		1
Net Accounts Receivable \| Concentration of Credit Risk \| Customer One
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, percentage									18.00%

Summary of Significant Accounting Policies - Summary of Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accounting Policies [Abstract]
Balance at Beginning of Period	$ 240
Provision for doubtful accounts	1,658	$ 368
Write–offs, Net of Recoveries	(1,226)
Balance at End of Period	$ 672

Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers by Geographical Region and by Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 94,737	$ 145,031	$ 252,426	$ 280,301
Marketplace Subscription Revenue
Disaggregation Of Revenue [Line Items]
Revenue	79,953	129,096	221,819	249,939
Advertising and Other Revenue
Disaggregation Of Revenue [Line Items]
Revenue	14,784	15,935	30,607	30,362
United States
Disaggregation Of Revenue [Line Items]
Revenue	89,746	137,010	237,752	265,413
United States \| Marketplace Subscription Revenue
Disaggregation Of Revenue [Line Items]
Revenue	75,457	122,352	208,481	237,373
United States \| Advertising and Other Revenue
Disaggregation Of Revenue [Line Items]
Revenue	14,289	14,658	29,271	28,040
International
Disaggregation Of Revenue [Line Items]
Revenue	4,991	8,021	14,674	14,888
International \| Marketplace Subscription Revenue
Disaggregation Of Revenue [Line Items]
Revenue	4,496	6,744	13,338	12,566
International \| Advertising and Other Revenue
Disaggregation Of Revenue [Line Items]
Revenue	$ 495	$ 1,277	$ 1,336	$ 2,322

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Acquisitions - Additional Information (Details) - USD ($) $ in Millions		6 Months Ended
	Jan. 16, 2020	Jun. 30, 2020
Business Acquisition [Line Items]
Acquisition-related costs incurred		$ 1.0
Product, Technology, and Development
Business Acquisition [Line Items]
Acquisition-related costs incurred		0.5
General and Administrative
Business Acquisition [Line Items]
Acquisition-related costs incurred		0.3
Sales and Marketing
Business Acquisition [Line Items]
Acquisition-related costs incurred		0.2
Autolist, Inc \| San Francisco, California
Business Acquisition [Line Items]
Business acquisition date	Jan. 16, 2020
Payments to acquire business	$ 21.0
Amount held in escrow	$ 2.2
Acquisition-related costs incurred		$ 1.4

Acquisitions - Summary of Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Thousands

Jun. 30, 2020

Jan. 16, 2020

Dec. 31, 2019

Business Acquisition [Line Items]

Goodwill

$ 27,623

$ 15,207

Autolist, Inc

Business Acquisition [Line Items]

Cash and cash equivalents

$ 50

Restricted cash

220

Accounts receivable

2,034

Intangible assets

^[1]

7,600

Goodwill

^[2]

12,409

Operating lease right-of-use assets

2,169

Other assets, net

162

Accounts payable and accrued expenses

(358)

Operating lease liabilities - current

(446)

Operating lease liabilities - non-current

(1,723)

Deferred tax liabilities

^[3]

(843)

Total purchase price

$ 21,274

[1]	Identifiable definite-lived intangible assets were comprised of brand, developed technology, and customer relationships of $5,600, $1,200 and $800, respectively, with estimated useful lives of 9 years, 3 years and 3 years, respectively, which will be amortized on a straight-line basis over their estimated useful lives. The fair value of the brand has been estimated using the multi-period excess earnings method which is a variation of the income approach. The fair value of the development technology and customer relationships has been estimated using a cost approach, which assesses the cost to redevelop the app and technology, and relationships, respectively.
[2]	The goodwill represents the excess value of the purchase price over net assets acquired. The goodwill in this transaction is primarily attributable to expected consumer traffic growth and shopper connections for dealers across both the CarGurus and Autolist websites, creating additional value for the Company’s premium subscription customers. All goodwill is assigned to the United States reporting segment. The acquisition of Autolist is treated as a stock acquisition for tax purposes and goodwill is not deductible for tax purposes.
[3]	The estimated deferred tax liability corresponds to the acquired intangible assets which have no tax basis. As a result of the estimated deferred tax liability, an adjustment was recorded to goodwill to account for the tax effect of the estimated deferred tax liability.

Acquisitions - Summary of Preliminary Purchase Price Allocation (Parenthetical) (Details) - Autolist, Inc - USD ($)
$ in Thousands

6 Months Ended

Jan. 16, 2020

Jun. 30, 2020

Business Acquisition [Line Items]

Intangible assets

^[1]

$ 7,600

Brand

Business Acquisition [Line Items]

Intangible assets

$ 5,600

Estimated useful lives

9 years

Developed Technology

Business Acquisition [Line Items]

Intangible assets

$ 1,200

Estimated useful lives

3 years

Customer Relationships

Business Acquisition [Line Items]

Intangible assets

$ 800

Estimated useful lives

3 years

[1]

Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments - Schedule of Fair Value Levels, Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments:	$ 43,000	$ 111,692
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments:	$ 43,000	$ 111,692
Debt Securities, Held-to-maturity, Type [Extensible List]	us-gaap:CertificatesOfDepositMember	us-gaap:CertificatesOfDepositMember
Total	$ 141,921	$ 140,888
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]
Total	98,921	29,196
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments:	$ 43,000	$ 111,692
Debt Securities, Held-to-maturity, Type [Extensible List]	us-gaap:CertificatesOfDepositMember	us-gaap:CertificatesOfDepositMember
Total	$ 43,000	$ 111,692
Fair Value, Measurements, Recurring \| Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	98,921	29,196
Fair Value, Measurements, Recurring \| Money Market Funds \| 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:	$ 98,921	$ 29,196

Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Maturity period of certificates of deposit	1 year	1 year
Maturity of certificates of deposit, description	Certificates of deposit at June 30, 2020 and December 31, 2019 had maturity dates of one year or less.
Liabilities, fair value	$ 0	$ 0

Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Certificates of deposit due in one year or less, Amortized Cost	$ 43,000	$ 111,692
Total investments, Amortized Cost	43,000	111,692
Certificates of deposit due in one year or less, Estimated Fair Value	43,000	111,692
Total investments, Estimated Fair Value	$ 43,000	$ 111,692

Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 50,312	$ 46,105
Less accumulated depreciation and amortization	(23,431)	(18,155)
Property and equipment, net	26,881	27,950
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,078	7,923
Capitalized Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	181	181
Capitalized Website Development Costs
Property Plant And Equipment [Line Items]
Property and equipment, gross	13,445	11,083
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,309	6,809
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	20,471	19,507
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	768	524
Finance Lease Right-of-use Assets
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 60	$ 78

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Property Plant And Equipment [Abstract]
Depreciation	$ 2,872	$ 1,750	$ 5,430	$ 3,222

Goodwill and Other Intangible Assets - Summary of Changes in Carrying Value of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balance at December 31, 2019	$ 15,207
Autolist acquisition	12,409
Foreign currency translation adjustment	7
Balance at June 30, 2020	$ 27,623

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 16, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill [Line Items]
Impairment of goodwill as a result of COVID-19				$ 0
Amortization expense of intangible assets		$ 485,000	$ 164,000	917,000	$ 319,000
Impairment of intangible assets, finite-lived as a result of COVID-19				$ 0
PistonHeads \| Brand
Goodwill [Line Items]
Estimated useful life				11 years
PistonHeads \| Customer Relationships
Goodwill [Line Items]
Estimated useful life				3 years
Autolist \| Brand
Goodwill [Line Items]
Estimated useful life	9 years			9 years
Autolist \| Customer Relationships
Goodwill [Line Items]
Estimated useful life	3 years			3 years
Autolist \| Developed Technology
Goodwill [Line Items]
Estimated useful life	3 years			3 years

Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,165	$ 4,569
Accumulated Amortization	1,566	649
Net Carrying Amount	$ 10,599	$ 3,920
Brand
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	8 years 10 months 24 days	10 years
Gross Carrying Amount	$ 9,123	$ 3,524
Accumulated Amortization	756	313
Net Carrying Amount	$ 8,367	$ 3,211
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	2 years 1 month 6 days	2 years
Gross Carrying Amount	$ 1,842	$ 1,045
Accumulated Amortization	626	336
Net Carrying Amount	$ 1,216	$ 709
Developed Technology
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	2 years 6 months
Gross Carrying Amount	$ 1,200
Accumulated Amortization	184
Net Carrying Amount	$ 1,016

Goodwill and Other Intangible Assets - Summary of Estimated Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2020	$ 959
2021	1,918
2022	1,683
2023	958
2024	939
2025	939
Thereafter	3,203
Net Carrying Amount	$ 10,599	$ 3,920

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities - Schedule of Accrued Expenses, Accrued Income Taxes and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Accrued bonus	$ 4,104	$ 8,637
Other accrued expenses, accrued income taxes and other current liabilities	8,887	9,625
Total	$ 12,991	$ 18,262

Accrued Expenses, Accrued Income Taxes and Other Current Liabilities - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Accrued Liabilities Current [Abstract]
Decrease in accrued bonus	$ 4,533

Restructuring - Additional Information (Details) - Expense Reduction Plan - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Apr. 13, 2020	Jun. 30, 2020	Jun. 30, 2020
Restructuring Cost And Reserve [Line Items]
Workforce reduction, percent	13.00%
Employee Severance and Related Benefits Expense
Restructuring Cost And Reserve [Line Items]
Restructuring and related charges		$ 3,248
Employee Severance and Related Benefits Expense \| Product, Technology, and Development
Restructuring Cost And Reserve [Line Items]
Restructuring and related charges		737
Employee Severance and Related Benefits Expense \| General and Administrative
Restructuring Cost And Reserve [Line Items]
Restructuring and related charges		144
Employee Severance and Related Benefits Expense \| Stock-Based Compensation Expense
Restructuring Cost And Reserve [Line Items]
Restructuring and related charges		667
Employee Severance and Related Benefits Expense \| Cost of Revenue
Restructuring Cost And Reserve [Line Items]
Restructuring and related charges		207
Employee Severance and Related Benefits Expense \| Sales and Marketing
Restructuring Cost And Reserve [Line Items]
Restructuring and related charges		2,160
International
Restructuring Cost And Reserve [Line Items]
Write-off of capitalized website development costs and deferred contract costs		1,019
Write-off of capitalized website development costs			$ 844
International \| Cost of Revenue
Restructuring Cost And Reserve [Line Items]
Write-off of capitalized website development costs		844
International \| Sales and Marketing
Restructuring Cost And Reserve [Line Items]
Write-off of deferred contract costs		175
International \| Employee Severance and Related Benefits Expense
Restructuring Cost And Reserve [Line Items]
Restructuring and related charges		$ 756

Restructuring - Summary of Restructuring Accrual Activity for Employee Severance and Related Benefits Expense (Details) - Expense Reduction Plan - Employee Severance and Related Benefits Expense $ in Thousands	3 Months Ended
	Jun. 30, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Charges	$ 3,248
Cash disbursements	(2,387)
Noncash settlements	(667)
Balance, June 30, 2020	$ 194

Commitments and Contingencies - Additional Information (Details) $ in Thousands	Jun. 30, 2020 USD ($)	Jun. 12, 2020 ft²	Jan. 16, 2020 ft²	Dec. 31, 2019 USD ($)
Commitments And Contingencies [Line Items]
Restricted cash \| $	$ 11,023			$ 10,803
Boston, Massachusetts at 1001 Boylston St
Commitments And Contingencies [Line Items]
Operating lease, office space		225,428
San Francisco, California at 332 Pine St
Commitments And Contingencies [Line Items]
Operating lease, office space			6,345

Stock-based Compensation - Summary of Stock-based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 11,923	$ 8,943	$ 23,604	$ 16,629
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	3	44	17	95
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 11,920	$ 8,899	$ 23,587	$ 16,534

Stock-based Compensation - Summary of Allocation of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 11,923	$ 8,943	$ 23,604	$ 16,629
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	85	95	184	176
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	3,064	2,560	5,756	4,872
Product, Technology, and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	5,316	3,997	10,721	7,180
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 3,458	$ 2,291	$ 6,943	$ 4,401

Stock-based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Capitalized website development and internal-use software costs excluded from stock-based compensation expense	$ 419	$ 317	$ 667	$ 626
Total payments for employees' tax obligations to taxing authorities due to net share settlements	$ 2,389	$ 4,637	$ 5,786	$ 8,591
Class A Common Stock
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Employee tax withholding requirements due to net share settlement	119,009	122,137	225,943	224,171

Earnings Per Share - Additional Information (Details)	3 Months Ended		6 Months Ended
Earnings Per Share - Additional Information (Details)	Jun. 30, 2020 shares	Jun. 30, 2019 shares	Jun. 30, 2020 Vote shares	Jun. 30, 2019 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 on either the death or voluntary termination of the Company’s Chief Executive Officer.
Undistributed earnings ratio used to calculate allocation to class of stock			100.00%
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 \| shares	3,748	0	339,489	0
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 \| shares			1

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	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ 7,131	$ 12,696	$ 6,007	$ 12,584	$ 19,827	$ 18,591
Denominator:
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders — basic	112,734,393		111,299,345		112,544,743	111,051,070
Dilutive effect of share equivalents resulting from stock options	674,063		1,195,429		735,474	1,322,752
Dilutive effect of share equivalents resulting from unvested restricted stock units	329,009		893,735		667,024	1,024,971
Weighted-average number of shares of common stock used in computing net income per share — diluted	113,737,465		113,388,509		113,947,241	113,398,793
Net income per share attributable to common stockholders:
Basic	$ 0.06		$ 0.05		$ 0.18	$ 0.17
Diluted	$ 0.06		$ 0.05		$ 0.17	$ 0.16

Earnings Per Share - Schedule of Potentially Dilutive Common Stock Equivalents Excluded from Calculation of Diluted Weighted-average Shares Outstanding (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
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	3,277,151	1,293,969	3,051,380	1,076,193

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 27, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income tax provision (benefit)		$ 2,052	$ (1,610)	$ 2,103	$ (5,113)
Effective income tax rate		22.30%	(36.60%)	9.60%	(37.90%)
Statutory tax rate		21.00%	21.00%	21.00%	21.00%
Reduction in gross net operating loss current	$ 18,723
Increase in deferred federal research & development credit	$ 2,645
Limitation on net operating loss to offset taxable income	80.00%

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Segment and Geographic Information - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment		2
Assets	$ 407,436	$ 407,436	$ 393,623
Goodwill	27,623	27,623	15,207
Intangible assets	10,599	10,599	3,920
International
Segment Reporting Information [Line Items]
Assets	27,918	27,918	32,528
Goodwill	15,214	15,214	15,207
Intangible assets	3,592	$ 3,592	$ 3,920
Expense Reduction Plan \| Employee Severance and Related Benefits Expense
Segment Reporting Information [Line Items]
Employee severance and related benefits expense	3,248
Expense Reduction Plan \| Employee Severance and Related Benefits Expense \| International
Segment Reporting Information [Line Items]
Employee severance and related benefits expense	756
Expense Reduction Plan \| Employee Severance and Related Benefits Expense \| United States
Segment Reporting Information [Line Items]
Employee severance and related benefits expense	$ 2,492

Segment and Geographic Information - Summary of Operations by Segment and Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment revenue:
Revenue	$ 94,737	$ 145,031	$ 252,426	$ 280,301
Segment income (loss) from operations:
Total income from operations	8,709	3,548	20,728	10,983
United States
Segment revenue:
Revenue	89,746	137,010	237,752	265,413
Segment income (loss) from operations:
Total income from operations	15,337	14,119	35,599	31,500
International
Segment revenue:
Revenue	4,991	8,021	14,674	14,888
Segment income (loss) from operations:
Total income from operations	$ (6,628)	$ (10,571)	$ (14,871)	$ (20,517)

- Definition

+ References

+ Details