Entity Central Index Key Accrued liabilities accrued income taxes and other liabilities current. Increase (decrease) in accrued liabilities accrued income taxes and other liabilities current. 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 Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Liabilities convertible preferred stock and stockholders' deficit equity. 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 Held To Maturity Securities Current Accounts receivable, net of allowance for doubtful accounts of $479 and $494, respectively Accounts Receivable Net Current Prepaid expenses and prepaid income taxes Prepaid Expense Current Deferred contract costs Contract With Customer Asset Net Current Other current assets Other Assets Current Restricted cash Restricted Cash 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 Deferred contract costs, net of current portion Contract With Customer Asset 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 Contract With Customer Liability 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] Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued and outstanding Preferred Stock Value Common stock Common Stock Value Additional paid–in capital Additional Paid In Capital Common Stock Retained earnings (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 Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding 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 Revenue From Contract With Customer Excluding Assessed Tax 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 [Abstract] Interest income Investment Income Interest Other income (expense) Other Nonoperating Income Expense Total other income, net Nonoperating Income Expense Income before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest (Benefit from) provision for income taxes Income Tax Expense Benefit Net income Net Income Loss Reconciliation of net income to net income (loss) attributable to common stockholders: Reconciliation Of Net Loss Income To Net Loss Income Attribute To Common Stockholders [Abstract] Net income Deemed dividend to preferred stockholders Temporary Equity Dividends Adjustment Net income attributable to participating securities Undistributed Earnings Loss Allocated To Participating Securities Basic Net income (loss) 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 (loss) attributable to common stockholders — diluted Net Income Loss Available To Common Stockholders Diluted Net income (loss) per share attributable to common stockholders: (Note 9) 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 (loss) 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 And Services 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 Number of new stock classified as temporary equity issued during the period. Number of shares of convertible preferred stock that was converted to other securities. Convertible stock shares converted. Convertible stock converted value. Statement Of Stockholders Equity [Abstract] Retained Earnings (Accumulated Deficit) 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 Loss Accumulated Other Comprehensive Income [Member] Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Series A Preferred Stock Series A Preferred Stock [Member] Series B Preferred Stock Series B Preferred Stock [Member] Series C Preferred Stock Series C Preferred Stock [Member] Series D Preferred Stock Series D Preferred Stock [Member] Series E Preferred Stock Series E Preferred Stock [Member] Beginning balance Convertible preferred stock, Beginning balance, Shares Temporary Equity Shares Outstanding Convertible preferred stock, Beginning balance Temporary Equity Carrying Amount Attributable To Parent Beginning balance, Shares Stock–based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Issuance of common stock upon exercise of stock options Stock Issued During Period Value Stock Options Exercised Issuance of common stock upon exercise of stock options, Shares Stock Issued During Period Shares Stock Options Exercised Issuance of common stock upon vesting of restricted stock units Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures Issuance of common stock upon vesting of restricted stock units, Shares Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures Tax benefit related to exercise of stock options Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation Issuance of stock, net of issuance/offering costs Stock Issued During Period Value New Issues Convertible preferred stock, Issuance of preferred stock, net of issuance costs, Shares Temporary Equity Stock Issued During Period Share New Issues Convertible preferred stock, Issuance of preferred stock, net of issuance costs Temporary Equity Stock Issued During Period Value New Issues Issuance of stock, net of issuance/offering costs, Shares Stock Issued During Period Shares New Issues Repurchase of stock Stock Repurchased During Period Value Repurchase of stock, Shares Stock Repurchased During Period Shares Payment of withholding taxes on net share settlements of equity awards Adjustments Related To Tax Withholding For Share Based Compensation Payment of withholding taxes on net share settlements of equity awards, Shares Shares Paid For Tax Withholding For Share Based Compensation Cumulative adjustment from adoption of revenue recognition standard (Note 2) Cumulative Effect On Retained Earnings Net Of Tax1 Conversion of preferred and common stock Stock Issued During Period Value Conversion Of Convertible Securities Net Of Adjustments Convertible preferred stock, Conversion of preferred stock, Shares Convertible Preferred Stock Shares Converted To Other Securities Convertible preferred stock, Conversion of preferred stock Convertible Preferred Stock Converted To Other Securities Conversion of preferred and common stock, shares issued Stock Issued During Period Shares Conversion Of Convertible Securities Conversion of preferred and common stock, shares converted Convertible Stock Shares Converted Conversion of preferred and common stock, value Convertible Stock Converted Value Ending balance Convertible preferred stock, Ending balance, Shares Convertible preferred stock, Ending balance Ending balance, Shares Convertible preferred stock, Net income (loss) Temporary Equity Net Income Stock issuance costs Payments Of Stock Issuance Costs Payments of deferred initial public offering costs. Non-cash unpaid initial public offering costs. Statement Of Cash Flows [Abstract] Operating Activities Net Cash Provided By Used In Operating Activities [Abstract] Net income Profit Loss 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 (gain) 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 Amortization of deferred contract costs Capitalized Contract Cost Amortization Excess tax benefit related to exercise of stock options Excess Tax Benefit From Share Based Compensation Operating Activities Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable, net Increase Decrease In Accounts Receivable Prepaid expenses, prepaid income taxes, and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Deferred contracts costs Increase Decrease In Contract With Customer Asset 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 Contract With Customer Liability 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 Investing Activities Net Cash Provided By Used In Investing Activities [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 Financing Activities Net Cash Provided By Used In Financing Activities [Abstract] Initial public offering proceeds Proceeds From Issuance Initial Public Offering Payment of initial public offering costs Payments Of Deferred Initial Public Offering Costs Proceeds from issuance of preferred stock Proceeds From Issuance Of Preferred Stock And Preference Stock Proceeds from exercise of stock options Proceeds From Stock Options Exercised Excess tax benefit related to exercise of stock options Excess Tax Benefit From Share Based Compensation Financing Activities Cash paid for repurchase of preferred stock, common stock, and vested options Payments For Repurchase Of Equity Payment of withholding taxes on net share settlements of equity awards Payments Related To Tax Withholding For Share Based Compensation Net cash (used in) provided by financing activities Net Cash Provided By Used In Financing Activities 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 Including Disposal Group And Discontinued Operations 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 Including Disposal Group And Discontinued Operations 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 Net Supplemental disclosure of non–cash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Unpaid purchases of property and equipment Capital Expenditures Incurred But Not Yet Paid Unpaid initial public offering costs Non Cash Unpaid Initial Public Offering Costs Capitalized stock-based compensation in website development costs Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount 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]