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Advertising Costs Advertising Cost [Policy Text Block] Total Shareholder Return Amount Total Shareholder Return Amount Reconciliation of cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Repurchase of common stock Payments for Repurchase of Common Stock Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Foreign Deferred Foreign Income Tax Expense (Benefit) Supplemental disclosures of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Grants in period, grant date intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Grant Date Fair Value Fair Value 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Beginning Balance (in shares) Redeemable Convertible Preferred Stock Ending Balance (in shares) Temporary Equity, Shares Outstanding Legal Entity [Axis] Legal Entity [Axis] Settlements Receivable Interchange Fee Settlements Receivable [Policy Text Block] Interchange Fee Settlements Receivable Realized gains or losses reclassified out of accumulated other comprehensive loss Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Operating lease, number of square feet Operating Lease, Number of Square Feet Operating Lease, Number of Square Feet Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Due within one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Business Combinations Business Combinations Policy [Policy Text Block] Leasehold improvements Leasehold Improvements [Member] Weighted-average shares used in computing net loss per share attributable to common stockholders - diluted (in shares) Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Common Stock Warrants Common Stock Warrants [Member] Common Stock Warrants Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Operating expenses: Operating Expenses [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Share Repurchase Program [Axis] Share Repurchase Program [Axis] Payments for commissions and discounts Payments for Commissions Executive compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive compensation, , Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive compensation, , Percent Exercisable, Weighted Average Remaining Contractual Life (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Compensation and benefits Labor and Related Expense Restructuring and Related Activities [Abstract] Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Non-NEOs Non-NEOs [Member] Total: Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Non-PEO NEO Non-PEO NEO [Member] Short-term investments Marketable Securities Adjustment to Compensation: Adjustment to Compensation [Axis] Research and development credits Deferred Tax Assets, Tax Credit Carryforwards, Research Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Federal and state net operating losses Deferred Tax Assets, Operating Loss Carryforwards Total contract assets Contract with Customer, Asset, after Allowance for Credit Loss Weighted-average shares used in computing net loss per share attributable to common stockholders - basic (in shares) Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Property and equipment Deferred Tax Assets, Property, Plant and Equipment Research and development credits Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Percent Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Costs of revenue Cost of Revenue Class of warrant or right, reduction to net revenues in the period Class of Warrant or Right, Reduction to Revenues, Net Class of Warrant or Right, Reduction to Revenues, Net Related Party Transaction [Axis] Related Party Transaction [Axis] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Statement [Line Items] Statement [Line Items] Conversion of redeemable convertible preferred stock to common stock upon initial public offering Stock Issued During Period, Value, Conversion of Convertible Securities Concentration Risk [Table] Concentration Risk [Table] Total share-based compensation expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount Computer Equipment, and Furniture and Fixtures Computer Equipment, and Furniture and Fixtures [Member] Computer Equipment, and Furniture and Fixtures Intangibles Deferred Tax Liabilities, Intangible Assets Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Accounts Payable and Accrued Liabilities