Entity Central Index Key Time deposits fair value. Document and entity information. Document And Entity Information [Abstract] Document And Entity Information Document and entity information Document And Entity Information [Table] Document And Entity Information [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Class A Common Stock Common Class A [Member] Class B Common Stock Common Class B [Member] Document And Entity Information [Line Items] Document And Entity Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Liabilities convertible preferred stock and stockholders' deficit equity. Accrued liabilities accrued income taxes and other liabilities current. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Investments Short Term Investments Accounts receivable, net of allowance for doubtful accounts of $690 and $494, respectively Accounts Receivable Net Current Prepaid expenses, prepaid income taxes and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Restricted cash Restricted Cash Noncurrent Deferred tax assets Deferred Tax Assets Net Noncurrent Other long–term assets Other Assets Noncurrent Total assets Assets Liabilities and stockholders’ equity Liabilities Convertible Preferred Stock And Stockholders Deficit Equity [Abstract] Current liabilities Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses, accrued income taxes and other current liabilities Accrued Liabilities Accrued Income Taxes And Other Liabilities Current Deferred revenue Deferred Revenue Current Deferred rent Deferred Rent Credit Current Total current liabilities Liabilities Current Deferred rent, net of current portion Deferred Rent Credit Noncurrent Other non–current liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 6) Commitments And Contingencies Stockholders’ equity: Stockholders Equity [Abstract] Common stock Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Current Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Reconciliation of net (loss) income to net (loss) income attributable to common stockholders. Income Statement [Abstract] Revenue Revenues Cost of revenue Cost Of Services Excluding Depreciation Depletion And Amortization Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Sales and marketing Selling And Marketing Expense Product, technology, and development Research And Development Expense General and administrative General And Administrative Expense Depreciation and amortization Depreciation And Amortization Total operating expenses Operating Expenses Income from operations Operating Income Loss Other income, net Nonoperating Income Expense Income before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net income Net Income Loss Reconciliation of net income to net income attributable to common stockholders: Reconciliation Of Net Loss Income To Net Loss Income Attribute To Common Stockholders [Abstract] Net income Net income attributable to participating securities Undistributed Earnings Loss Allocated To Participating Securities Basic Net income attributable to common stockholders — basic Net Income Loss Available To Common Stockholders Basic Net income attributable to participating securities Undistributed Earnings Loss Allocated To Participating Securities Diluted Net income attributable to common stockholders — diluted Net Income Loss Available To Common Stockholders Diluted Net income per share attributable to common stockholders: (Note 8) Earnings Per Share Basic And Diluted [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders: Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Basic Shares Outstanding Pro Forma Diluted Pro Forma Weighted Average Shares Outstanding Diluted Depreciation and amortization expense Cost Of Goods Sold Depreciation And Amortization Statement Of Income And Comprehensive Income [Abstract] Other comprehensive income: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Foreign currency translation adjustment Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Comprehensive income Comprehensive Income Net Of Tax Convertible stock shares converted. Convertible stock converted value. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Beginning balance Beginning balance, Shares Stock option exercises Stock Issued During Period Value Stock Options Exercised Stock option exercises, shares Stock Issued During Period Shares Stock Options Exercised Stock–based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Conversion of common stock, value issued Stock Issued During Period Value Conversion Of Convertible Securities Net Of Adjustments Conversion of common stock, shares issued Stock Issued During Period Shares Conversion Of Convertible Securities Conversion of common stock, shares converted Convertible Stock Shares Converted Conversion of common stock, value Convertible Stock Converted Value Ending balance Ending balance, Shares Increase (decrease) in accrued liabilities accrued income taxes and other liabilities current. Payments of deferred initial public offering costs. Capitalized stockholders' compensation in website development costs. Statement Of Cash Flows [Abstract] Operating Activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Unrealized currency loss on foreign denominated transactions Foreign Currency Transaction Gain Loss Unrealized Deferred taxes Deferred Income Tax Expense Benefit Provision for doubtful accounts Provision For Doubtful Accounts Stock-based compensation expense Share Based Compensation Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Prepaid expenses, prepaid income taxes, and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses, accrued income taxes, and other current liabilities Increase Decrease In Accrued Liabilities Accrued Income Taxes And Other Liabilities Current Deferred revenue Increase Decrease In Deferred Revenue Deferred rent Increase Decrease In Deferred Charges Other non-current liabilities Increase Decrease In Other Noncurrent Liabilities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Investing Activities Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Purchases of property and equipment Payments To Acquire Property Plant And Equipment Capitalization of website development costs Payments To Develop Software Investments in certificates of deposit Payments To Acquire Restricted Certificates Of Deposit Maturities of certificates of deposit Proceeds From Sale Maturity And Collections Of Investments Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Financing Activities Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Proceeds from exercise of stock options Proceeds From Stock Options Exercised Payment of initial public offering costs Payments Of Deferred Initial Public Offering Costs Net cash (used in) provided by financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Impact of foreign currency on cash, cash equivalents, and restricted cash Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Net (decrease) increase in cash, cash equivalents, and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash, cash equivalents, and restricted cash at beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash, cash equivalents, and restricted cash at end of period Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for income taxes Income Taxes Paid Cash paid for interest Interest Paid Supplemental disclosure of non-cash investing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Unpaid purchases of property and equipment Capital Expenditures Incurred But Not Yet Paid Capitalized stockholders' compensation in website development costs Capitalized Stockholders Compensation In Website Development Costs Accounting Policies [Abstract] Organization and Business Description Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Including Cash, Cash Equivalents and Investments Financial Instruments Disclosure [Text Block] Property Plant And Equipment [Abstract] Property and Equipment, Net Property Plant And Equipment Disclosure [Text Block] Accrued Liabilities Current [Abstract] Accrued Expenses, Accrued Income Taxes and Other Current Liabilities Accounts Payable Accrued Liabilities And Other Liabilities Disclosure Current [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock-based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Segment Reporting [Abstract] Segment and Geographic Information Segment Reporting Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Principles of Consolidation Consolidation Policy [Text Block] Subsequent Event Considerations Subsequent Events Policy Policy [Text Block] Use of Estimates Use Of Estimates Emerging growth company status. Emerging Growth Company Status Emerging Growth Company Status Policy [Text Block] Concentration of Credit Risk Concentration Risk Credit Risk Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Fair Value Measurement and Disclosures Fair Value Measurement Policy Policy [Text Block] Fair Value of Financial Instruments Including Cash, Cash Equivalents and Investments Fair Value Of Financial Instruments Policy Schedule of Fair Value Levels, Assets Measured at Fair Value on Recurring Basis Fair Value Assets Measured On Recurring Basis [Text Block] Schedule of Cash, Cash Equivalents, and Investments Schedule Of Cash Cash Equivalents And Short Term Investments Table [Text Block] Schedule of Property and Equipment Property Plant And Equipment [Text Block] Schedule of Accrued Expenses, Accrued Income Taxes and Other Current Liabilities Schedule Of Accrued Liabilities Table [Text Block] Summary of Stock-based Compensation Expense by Award Type Schedule Of Compensation Cost For Share Based Payment Arrangements Allocation Of Share Based Compensation Costs By Plan Table [Text Block] Summary of Allocation of Stock-based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net (Loss) Income Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Potentially Dilutive Common Stock Equivalents Excluded from Calculation of Diluted Weighted-average Shares Outstanding Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Summary of Operations by Segment and Geographical Area Schedule Of Segment Reporting Information By Segment [Text Block] State of incorporation Entity Incorporation State Country Name Date of incorporation Entity Incorporation Date Of Incorporation Emerging growth company description. Emerging growth company threshold revenue. Emerging growth company status value of common stock held by non affiliates. Emerging growth company status issuance value of non convertible debt securities. Emerging growth company status period for issuance of non convertible debt securities. Summary of significant accounting policies. Summary of significant accounting policies. Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Range Range [Axis] Range Range [Member] Minimum Minimum [Member] Maximum [Member] Maximum [Member] Concentration Risk Benchmark Concentration Risk By Benchmark [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Sales Revenue, Net Sales Revenue Net [Member] Concentration Risk Type Concentration Risk By Type [Axis] Concentration Risk Type Concentration Risk Type [Domain]