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Accrued Liabilities Statement of Cash Flows [Abstract] Maximum Exposure to Losses Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Vested and exercisable, and expected to vest thereafter (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Class of Stock [Line Items] Class of Stock [Line Items] Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Unrealized gain (loss) on securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Early exercise rights liability Share-Based Compensation Arrangement By Share-based Payment Award, Options, Early Exercise Rights Liability Share-Based Compensation Arrangement By 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[Member] Returnly Technologies, Inc. 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Financing Receivable, Originated, More than Five Years before Current Fiscal Year RSUs awarded (in shares) Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Cash Equivalents Cash Equivalents [Member] Revenue concentration percent Concentration Risk, Percentage Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 4 – 29 calendar days past due Financial Asset, 4 to 29 Days Past Due [Member] Financial Asset, 4 to 29 Days Past Due Trade name Trade Names [Member] Debt Instrument [Axis] Debt Instrument [Axis] Sales and Marketing Costs Advertising Cost [Policy Text Block] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Series G-1 Preferred Stock Series G-1 Preferred Stock [Member] Series G-1 Preferred Stock Commercial agreement warrant expense Increase (Decrease) In Commercial Agreement Assets Increase (Decrease) In Commercial Agreement Assets Contingent consideration, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Long-lived Assets by Geographic Areas Long-lived Assets by Geographic Areas [Table Text Block] Secured debt Secured Debt [Member] Percentage ownership after transaction Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage Schedule of Pro Forma Consolidated Total Revenues and Net Loss Business Acquisition, Pro Forma Information [Table Text Block] 2020-Z2 Affirm Asset Securitization Trust 2020-Z2 Notes [Member] Affirm Asset Securitization Trust 2020-Z2 Notes Vesting rights percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Change in unrealized gain (loss) Effect of foreign currency translation Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Commitments and Contingencies Disclosure [Abstract] Stock-based compensation included in capitalized internal-use software Capitalized into property, equipment and software, net Share-based Payment Arrangement, Amount Capitalized Volatility Class Of Warrants Or Rights, Volatility Class Of Warrants Or Rights, Volatility Accounts payable Accounts Payable, Fair Value Disclosure Repurchase liability Assets Sold under Agreements to Repurchase, Repurchase Liability Number of operating segments Number of Operating Segments Remaining amount available of credit facility Line of Credit Facility, Remaining Borrowing Capacity Commercial agreement asset, gross Commercial Agreement Asset, Gross Commercial Agreement Asset, Gross Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Three Gain on conversion of convertible debt Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 2026 and thereafter Long-Term Debt, Maturity, Year Five Equity exercise taxes payable Share-based Compensation Arrangement by Share-based Payment Award, Exercise Taxes Payable Share-based Compensation Arrangement by Share-based Payment Award, Exercise Taxes Payable Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets Purchases and origination of loans held for investment Payments to Acquire Finance Receivables Processing and servicing Processing And Servicing Expense [Member] Processing And Servicing Expense Less than 90 ITAC Score, Less than 90 [Member] ITAC Score, Less than 90 Loss rate Measurement Input, Loss Rate [Member] Measurement Input, Loss Rate Tax withholding on stock-based compensation Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Number of common stock available for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Cash paid for operating leases Operating Lease, Payments Commercial agreement term Warrants Exercised, Commercial Agreement Term Warrants Exercised, Commercial Agreement Term Escrow deposit Escrow Deposit Purchase price Total purchase price Business Combination, Consideration Transferred Borrowings outstanding Funding debt Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Changes in fair value of assets and liabilities Gain (Loss) On Changes In Fair Value Of Assets And Liabilities Gain (Loss) On Changes In Fair Value Of Assets And Liabilities Total assets Assets, Fair Value Disclosure Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Expenses on sale of warrants Class Of Warrants Or Rights, Expenses On Grant Date Fair Value On Sale Of Warrants Class Of Warrants Or Rights, Expenses On Grant Date Fair Value On Sale Of Warrants Subsequent changes in fair value Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Weighted average common shares outstanding: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] 2020 Current period net charge-offs Financing Receivable, Year Three, Originated, Two Years Before Current Fiscal Year, Write Off (Recoveries), Net Financing Receivable, Year Three, Originated, Two Years Before Current Fiscal Year, Write Off 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Debt Securities [Member] Residual Certificate Pledged Securities Residual Certificate Pledged Securities [Member] Residual Certificate Pledged Securities Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] 2019 Current period recoveries Financing Receivable, Year Four, Originated, Three Years Before Current Fiscal Year, Recoveries Financing Receivable, Year Four, Originated, Three Years Before Current Fiscal Year, Recoveries Profit share liability Commercial Agreement, Profit Share Liability, Fair Value Disclosure Commercial Agreement, Profit Share Liability, Fair Value Disclosure Business Description Business Description and Basis of Presentation [Text Block] Net Loss per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Impairment expense Operating Lease, Impairment Loss Operating Expenses Operating Expenses [Abstract] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Conversion of convertible debt Adjustment to Additional 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Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Funding debt Line of Credit [Member] Equity Incentive Plans Share-based Payment Arrangement [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Accrued expenses and other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Liabilities and Other Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Liabilities and Other Liabilities Percentage of certificates owned Securitized Assets, Percentage Of Certificates Owned Securitized Assets, Percentage Of Certificates Owned Preferred stock issuance costs Payments of Stock Issuance Costs Number of reportable segments Number of Reportable Segments Schedule of Interest Income Interest Income and Interest Expense Disclosure [Table Text Block] Loans held by third party investors or unconsolidated VIEs Assets Sold under Agreements to Repurchase, Carrying Amount Cash collateral and deposits for letters of credit Cash Collateral And Deposits For Letters Of Credit [Member] Cash Collateral And Deposits For Letters Of Credit Additions Goodwill, Acquired During Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Non-delinquent loans Financial Asset, Not Past Due [Member] Commitments and contingencies (Note 8) Commitments and Contingencies Subsequent Event [Table] Subsequent Event [Table] Conversion Period One Conversion Period One [Member] Conversion Period One Payable to third-party loan owners Increase (Decrease) in Third Party Loan Owner Payable Increase (Decrease) in Third Party Loan Owner Payable Accumulated other comprehensive gain (loss) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company Proceeds from debt Proceeds from Debt, Net of Issuance Costs Accrued interest payable Interest Payable, Fair Value Disclosure Interest Payable, Fair Value Disclosure Total current period net charge-offs Financing Receivables, Write Off (Recoveries), Net Financing Receivables, Write Off (Recoveries), Net Payment of debt issuance costs Payments of Debt Issuance Costs Commercial Agreement Asset, Enterprise Partner, Stock Appreciation Rights Commercial Agreement Asset, Enterprise Partner, Stock Appreciation Rights [Member] Commercial Agreement Asset, Enterprise Partner, Stock Appreciation Rights Receivables [Abstract] Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Cover [Abstract] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Total Operating Expenses Costs and Expenses Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Numerator, Diluted Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount CALIFORNIA CALIFORNIA Amortization of commercial agreement assets Amortization Of Commercial Agreement Assets Amortization Of Commercial Agreement Assets Securities available for sale at fair value Debt Securities, Available For Sale, Fair Value Disclosure Debt Securities, Available For Sale, Fair Value Disclosure Financial Instrument [Axis] Financial Instrument [Axis] Common stock issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 2021 Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year Schedule of 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Liability, Effect Of Twenty Five Percentage Point Increase (Decrease) In Measurement Input Stock-based compensation Share-based Payment Arrangement, Noncash Expense Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Common stock issued in escrow, subject to forfeiture (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares, Contingent Consideration Business Acquisition, Equity Interest Issued or Issuable, Number of Shares, Contingent Consideration Adequate compensation Measurement Input, Adequate Compensation [Member] Measurement Input, Adequate Compensation Largest merchant partner Largest Merchant Partner [Member] Largest Merchant Partner Purchases of securities available for sale Payments to Acquire Debt Securities, Available-for-sale Schedule of Restricted Stock Unit Activity Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Cash paid for income taxes Income Taxes Paid Loans held for investment, net Financing Receivable, Fair Value Disclosure Financing Receivable, Fair Value Disclosure Additions to property, equipment and software Payments to Acquire Property, Plant, and Equipment Total liabilities Total liabilities Liabilities Liabilities Servicing assets Servicing Asset 2023 Finite-Lived Intangible Asset, Expected Amortization, Year One Granted (in USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Vested and exercisable, and expected to vest thereafter (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Certificates of deposit, corporate bonds, and commercial paper classified as cash and cash equivalents Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired, Cash Flows Expected to be Collected at Acquisition Total stock-based 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