Cover [Abstract] Document Information [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Nonvoting Common Stock [Member] Non-Voting Common Stock [Member] Voting Common Stock [Member] Voting common stock. Document Information [Line Items] Document Type Document Quarterly Report Document Transition Report Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity File Number Entity Registrant Name Entity Central Index Key Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Common Stock, Shares Outstanding Amendment Flag Current Fiscal Year End Date Statement of Financial Position [Abstract] Statement [Table] Convertible Preferred Stock [Member] Convertible Preferred Stock [Member] Redeemable Convertible Preferred Stock [Member] Redeemable Convertible Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable, net of allowance for doubtful accounts of $167 and $496, respectively Accounts receivable, net of allowances Restricted Cash, Current Restricted cash Due from Related Parties, Current Funds receivable from payment partners Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Unbilled Receivables, Current Unbilled receivables Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Property, Plant and Equipment, Net Property and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Ending balance Beginning balance Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities, Convertible Preferred Stock, Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Due to Related Parties, Current Funds payable to clients Accrued Expenses And Other Current Liabilities Accrued expenses and other current liabilities Accrued expenses and other current liabilities. Deferred Revenue, Current Deferred revenue Deferred revenue—current Business Combination, Contingent Consideration, Liability, Current Contingent consideration Liabilities, Current Total current liabilities Deferred Income Tax Liabilities, Net Deferred tax liabilities Business Combination, Contingent Consideration, Liability, Noncurrent Contingent consideration, net of current portion Long-term Debt, Excluding Current Maturities Long-term debt Stockholders' Equity Attributable to Parent [Abstract] Stockholders' (deficit) equity: Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Retained Earnings (Accumulated Deficit) Accumulated (deficit) Liabilities and Equity Total liabilities, convertible preferred stock, redeemable convertible preferred stock and stockholders' (deficit) equity Common Stock, Value, Issued Voting common stock, $0.0001 par value; 2,000,000,000 and 146,898,270 shares authorized as of June 30, 2021 and December 31, 2020, respectively, 100,995,903 shares issued and 98,678,181 shares outstanding as of June 30, 2021; 22,240,872 shares issued and 19,923,150 shares outstanding as of December 31, 2020 Common Stock Value Non Voting Right Non-voting common stock, $0.0001 par value;10,000,000 and 0 shares authorized as of June 30, 2021 and December 31, 2020, respectively; 5,988,378 and 0 issued and outstanding as of June 30, 2021 and December 31, 2020, respectively Common stock value non-voting right. Treasury Stock, Value Treasury Stock, 2,317,722 shares as of June 30, 2021 and December 31, 2020, held at cost Additional Paid in Capital Additional paid-in capital Stockholders' Equity Attributable to Parent Total stockholders' equity (deficit) Beginning balance Ending balance Preferred Stock, Value, Issued Preferred stock, $0.0001 par value; 10,000,000 and 0 shares authorized as of June 30, 2021 and December 31, 2020, respectively; and none issued and outstanding as of June 30, 2021 and December 31, 2020, respectively Derivative Liability, Noncurrent Preferred stock warrant liability Other Liabilities, Noncurrent Other liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies (Note 14) Temporary Equity, Carrying Amount, Attributable to Parent Convertible preferred stock Accounts Receivable, Allowance for Credit Loss, Current Accounts Receivable, Allowance for Credit Loss, Current Temporary Equity, Par or Stated Value Per Share Temporary Equity, Par or Stated Value Per Share Common Stock, Shares, Issued Common Stock, Shares, Issued Treasury Stock, Shares Treasury Stock, Shares Temporary Equity, Shares Authorized Temporary Equity, Shares Authorized Common Stock Par Or Stated Value Per Share Non Voting Right Common Stock, Par or Stated Value Per Share, Non-voting right Common Stock, Par or Stated Value Per Share, Non Voting right Common stock, par or stated value per share, non-voting right. Common Stock Shares Authorized Non Voting Right Common Stock, Shares Authorized, Non-voting right Common Stock, Shares Authorized, Non Voting right Common stock shares authorized non-voting right. Common Stock Shares Issued Non Voting Right Common Stock, Shares, Issued, Non-voting right Common stock, shares, issued, non-voting right. Common Stock Shares Outstanding Non Voting Right Common Stock, Shares, Outstanding, Non-voting right Common stock, shares, outstanding, non-voting right. Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Temporary Equity, Shares Issued Temporary Equity, Shares Issued Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares Authorized Temporary Equity, Shares Outstanding Temporary Equity, Shares Outstanding Temporary Equity, Liquidation Preference Temporary Equity, Liquidation Preference Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Income Statement [Abstract] Revenues Revenue Operating Income (Loss) Loss from operations Nonoperating Income (Expense) [Abstract] Other income (expense): Interest Expense Interest expense Interest expense Change in Fair Value of Preferred Stock Warrant Liability Change in fair value of preferred stock warrant liability Change in fair value of preferred stock warrant liability. Other Nonoperating Income (Expense) Other income (expense), net Nonoperating Income (Expense) Total other expenses, net Income Tax Expense (Benefit) (Benefit from) provision for income taxes Income tax expense (benefit) Net Income (Loss) Attributable to Parent Net loss Net income (loss) Net loss Net Loss Operating Expenses [Abstract] Costs and operating expenses: Operating Expenses Total costs and operating expenses Research and Development Expense Technology and development Payment Processing Services Costs Payment processing services costs Payment processing services costs. Selling and Marketing Expense Selling and marketing General and Administrative Expense General and administrative Net Income (Loss) Available to Common Stockholders, Diluted Net loss attributable to common stockholders – basic and diluted Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss before provision for income taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss Earnings Per Share, Basic and Diluted Net loss per share attributable to common stockholders – basic and diluted Net loss per share attributable to common stockholders - basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average common shares outstanding – basic and diluted Weighted average shares outstanding - basic and diluted Product and Service [Axis] Product and Service [Domain] Statement of Stockholders' Equity [Abstract] APIC, Share-based Payment Arrangement, Increase for Cost Recognition Stock-based compensation expense Shares, Outstanding Beginning balance, Shares Ending balance, Shares Stock Issued During Period, Value, New Issues Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions Conversion of redeemable convertible preferred stock upon initial public offering shares Conversion of redeemable convertible preferred stock upon initial public offering, Shares Conversion of redeemable convertible preferred stock upon initial public offering shares. Conversion of redeemable convertible preferred stock upon initial public offering value Conversion of redeemable convertible preferred stock upon initial public offering Conversion of redeemable convertible preferred stock upon initial public offering value. Accretion Of Redeemable Convertible Preferred Stock Accretion of redeemable convertible preferred stock Accretion of redeemable convertible preferred stock. Shares Issued, Shares, Share-based Payment Arrangement, Forfeited Forfeiture of unvested restricted stock awards, Shares Adjustments To Additional Paid In Capital Issuance Of Common Stock Warrants Value Issuance of common stock warrants Adjustments To Additional Paid In Capital Issuance Of Common Stock Warrants Value Stock Issued During Period, Shares, New Issues Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions, Shares Stock shares issued during the period shares Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Costs incurred in connection with initial public offering Stock Issued During Period, Value, Other Issuance of Convertible Preferred Stock upon net exercise of warrants Issuance of Series Convertible Preferred Stock upon net exercise of warrants Stock Issued During Period, Shares, Conversion of Units Conversion of convertible preferred stock upon initial public offering, Shares Stock Issued During Period, Value, Conversion of Units Conversion of convertible preferred stock upon initial public offering Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Issuance of common stock upon exercise of stock options, Shares Number of Shares , Exercised Adjustments to Additional Paid in Capital, Warrant Issued Reclassification of warrant liability to additional paid-in capital upon initial public offering Stock Issued During Period Value Stock Warrants Exercised Exercise of common stock warrants Stock Issued During Period Value Stock Warrants Exercised Stock Issued During Period Shares Stock Warrants Exercised Exercise of common stock warrants, shares Stock Issued During Period Shares Stock Warrants Exercised Stock Issued During Period, Shares, Other Issuance of Convertible Preferred Stock upon net exercise of warrants, Shares Stock Issued During Period, Shares, Other Issuance of Series Convertible Preferred Stock upon net exercise of warrants shares Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock upon exercise of stock options Equity Components [Axis] Equity Component [Domain] Treasury Stock [Member] Treasury Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Common Stock [Member] Common Stock [Member] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Member] Retained Earnings [Member] Accumulated Deficit [Member] Series E Preferred Stock [Member] Series E Preferred Stock [Member] Series F1 Preferred Stock [Member] Series F1 Preferred Stock [Member] Series F-1 Preferred Stock [Member]. Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs Issuance cost Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Change in fair value of contingent consideration Amount of increase (decrease) in the value of a contingent consideration liability, Personnel Costs Deferred Income Taxes and Tax Credits Deferred tax provision Depreciation, Depletion and Amortization Depreciation and amortization Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities, net of acquisition: Increase (Decrease) in Unbilled Receivables Unbilled receivables Increase (Decrease) in Due from Related Parties, Current Funds receivable from payment partners Increase Decrease In Contingent Consideration Contingent consideration Increase decrease in contingent consideration. Increase (Decrease) in Other Operating Liabilities Other liabilities Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Accounts Payable, Trade Funds payable to clients Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable, accrued expenses and other current liabilities Increase (Decrease) in Deferred Revenue Deferred revenue Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Share-based Payment Arrangement, Noncash Expense Stock-based compensation expense Amortization Of Deferred Contract Costs Amortization of deferred contract costs Amortization of deferred contract costs. Fair Value Adjustment of Warrants Change in fair value of preferred stock warrant liability Other Operating Activities, Cash Flow Statement Other Paid-in-Kind Interest Non-cash interest expense Accounts Receivable, Credit Loss Expense (Reversal) Bad debt expense Provisions Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Issuance Initial Public Offering Proceeds from initial public offering, net of underwriting discounts and commissions Proceeds from initial public offering Payments of Debt Issuance Costs Payment of long-term debt issuance costs Payment for Contingent Consideration Liability, Financing Activities Contingent consideration paid for acquisitions Payments of Stock Issuance Costs Payment of costs related to initial public offering Repayments of Long-term Debt Payment of long-term debt Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs Proceeds from Warrant Exercises Proceeds from exercise of warrants Proceeds from Stock Options Exercised Proceeds from exercise of stock options Proceeds from Issuance of Long-term Debt Proceeds from issuance of long-term debt Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net (decrease) increase in cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash and Cash Equivalents Effect of exchange rates changes on cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash, end of period Cash, cash equivalents and restricted cash, beginning of period Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Businesses, Net of Cash Acquired Acquisition of businesses, net of cash acquired Asset Acquisition, Net of Cash Acquired Asset acquisition, net of cash acquired Asset acquisition, net of cash acquired.