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Payment Award, Expiration Period Upon Termination Of Service Common Stock Stockholders' Equity Note Disclosure [Text Block] Customer funds receivable Increase (Decrease) In Settlement Assets Increase (Decrease) In Settlement Assets Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Statement of Cash Flows [Abstract] Class of Stock [Line Items] Class of Stock [Line Items] Credit Facility [Axis] Credit Facility [Axis] Other comprehensive income (loss): Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Entity Address, Address Line One Entity Address, Address Line One Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Entity Address, Address Line Two Entity Address, Address Line Two Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Less: Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Issuance of common stock through Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Cash flows from operating activities Net Cash Provided by (Used in) Operating 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 General and administrative General and Administrative Expense [Member] Principles of Consolidation Consolidation, Policy [Policy Text Block] Entity Shell Company Entity Shell Company Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current ESPP Employee Stock [Member] Minimum liquidity Line of Credit Facility, Covenant Terms, Minimum 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Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Statement [Table] Statement [Table] Advertising expense Advertising Expense Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Cliff vesting period Share-based Compensation Arrangement by Share-based Payment Award, Cliff Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Cliff Award Vesting Period Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Member] Unamortized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Cost of revenue Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Statistical Measurement [Axis] Statistical Measurement [Axis] Capitalized internal-use software costs Payments for Software Subsequent Event Subsequent Event [Member] Customer support and operations Cost of Sales [Member] Write off of debt issuance cost Write off of Deferred Debt Issuance Cost Adjustments to reconcile net loss to net cash provided by (used in) operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Related Party Arrangements Related Party Transactions Disclosure [Text Block] Schedule of ESPP Valuation Assumptions Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term