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Derivative Credit Card Derivative [Member] Credit Card Derivative Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Series G Series G Preferred Stock [Member] Weighted-average market servicing rate Fair Value Assumptions, Weighted Average Market Servicing Rate Fair Value Assumptions, Weighted Average Market Servicing Rate Schedule of Fair Value of Stock Option Awards Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Payable to Investors Payable to Investors Payable To Investors Options Issued and Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Non-Cash Financing Activity – Contributions of Borrower Loans from Parent (Note 4) Contributions of Borrower Loans By Parent Contributions of Borrower Loans By Parent Loan Trailing Fee Liability: Loan Trailing Fee Liability 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Shares Reserved for Future Issuance 2024-1, Class D Notes Securtization Trust PMIT 2024-1, Class D Notes [Member] Securtization Trust PMIT 2024-1, Class D Notes Stock-Based Compensation Share-Based Payment Arrangement [Text Block] PEO PEO [Member] Interest Expense on Term Loan Interest Expense, Other Long-Term Debt Options expired (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Accumulated Deficit Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Total Expenses Operating Expenses Internal-use software and website development costs Software, In-Development, Internally Developed, and Purchased [Member] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Increase (Decrease) in Stockholders' Equity [Roll 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Value Financial Instruments Assets And Liabilities Not Recorded At Fair Value [Table Text Block] 2023-1, Class B Notes Securtization Trust PMIT 2023-1, Class B Notes [Member] Securtization Trust PMIT 2023-1, Class B Notes Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Proceeds from Principal Payments and Sales of Borrower Loans, at Fair Value Proceeds from Principal Payments and Sales of Borrower Loans, at Fair Value Proceeds From Sale And Principal Payment Of Borrower Loans Held At Fair Value Principal payment of borrower loans held at fair value. Purchase of stock by consolidated VIE (in shares) Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number ROU Assets - Office buildings Office Building [Member] IPO value (at least) Value Prior To Closing Of Underwritten Initial Public Offering On Conversion Schedule of Summarized Option Activity Under Option Plan Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Fair value assumptions Fair value assumptions Debt Securities, Available-for-Sale, Measurement Input Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Voting power (at least) (as a percent) 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changes Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Other Changes Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Transaction fee cap percentage (as a percent) Transaction Fee Cap Percentage Transaction Fee Cap Percentage Convertible preferred stock, authorized (in shares) Temporary Equity, Shares Authorized Payment for loan Payment for Debt Extinguishment or Debt Prepayment Cost Net Income (Loss) Before Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Commitments and Contingencies (Note $17) Commitments and Contingencies Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Property, plant and equipment, gross Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Securitization Trust PMCC 2026-1 Securitization Trust PMCC 2026-1 [Member] Securitization Trust PMCC 2026-1 Executive Category: Executive Category [Axis] Aggregate Amount of Notes Purchased Aggregate Amount Of Notes And Borrower Loans Purchased By Related Parties Total Net Revenues Revenues, Net of Interest Expense Liabilities, Convertible Preferred Stock and Stockholders' Deficit: Liabilities and Member’s Equity: Liabilities and Equity [Abstract] Loan Trailing Fee Liability Trailing Fee [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Class of warrant or right, outstanding (in shares) Class of Warrant or Right, Outstanding Loss on Sale of Borrower Loans Gain (loss) on sales of loans, net Gain (Loss) on Sales of Loans, Net Securtization Trust PMCC 2024-1, Class C Notes Securtization Trust PMCC 2024-1, Class C Notes [Member] Securtization Trust PMCC 2024-1, Class C Notes Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Loan trailing fee liability Loan Trailing Fee Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Information [Abstract] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities PEO Name PEO Name Leasehold improvements Leasehold Improvements [Member] Convertible preferred stock, issued (in shares) Temporary Equity, Shares Issued Cash Paid for Income Taxes Income Tax Paid, before Refund Received Other Expenses Segment Reporting, Other Segment Item, Amount Property, Plant and Equipment, Type [Axis] Long-Lived Asset, Class [Axis] Schedule of Derivative Liability Measured at Fair Value Schedule of Derivative Liability Measured at Fair Value [Table Text Block] Schedule of Derivative Liability Measured at Fair Value Transfers of Financial Assets Transfers and Servicing of Financial Assets, Transfers of Financial Assets, Policy [Policy Text Block] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Payments of Notes, at Fair Value Payment Of Notes Held At Fair Value Prosper Funding LLC Prosper Funding LLC Prosper Funding LLC [Member] Prosper Funding LLC Prepaid and Other Assets Prepaid Expense and Other Assets Payable to Related Party Notes, Aggregate principal balance and interest outstanding Notes Payable Market servicing rate Measurement Input, Market Servicing Rate [Member] Measurement Input, Market Servicing Rate Options exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Purchases of Borrower Loans/Issuance of Notes Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Securtization Trust PMCC 2026-1, Class C Notes Securtization Trust PMCC 2026-1, Class C Notes [Member] Securtization Trust PMCC 2026-1, Class C Notes Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Stock-Based Compensation Expense Share-Based Payment Arrangement, Noncash Expense Compensation and Benefits Labor and Related Expense Net Income (Loss) Per Share - Basic (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Insider Trading Arrangements [Line Items] Accelerated amortization of debt issuance costs and debt discounts, EBITDA Accelerated Amortization Of Debt Issuance Costs And Debt Discounts, EBITDA Accelerated Amortization Of Debt Issuance Costs And Debt Discounts, EBITDA Fee deposits refund obligation, issued Fee Deposits Refund Obligation, Refunds Issued Fee Deposits Refund Obligation, Refunds Issued Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Loan Trailing Fee Liability (Note 10) Obligations, Fair Value Disclosure Volatility of common stock Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] 100 basis point decrease in both discount rates 100 Basis Point Decrease [Member] 100 Basis Point Decrease Fair Value Inputs Assets Quantitative Information [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair value resulting from: Receivable From Credit Card Partner, Expected Fair Value With Change In Assumptions Receivable From Credit Card Partner, Expected Fair Value With Change In Assumptions Notes Loans Payable [Member] Equity Awards Adjustments Equity Awards Adjustments [Member] Expected fair value with change in assumptions Derivative Asset, Expected Fair Value With Change In Assumptions Derivative Asset, Expected Fair Value With Change In Assumptions 2023-1, Class E Notes Securtization Trust PMIT 2023-1, Class E Notes [Member] Securtization Trust PMIT 2023-1, Class E Notes Prepayment rate Measurement Input, Prepayment Rate [Member] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Other Liabilities Increase (Decrease) in Other Operating Liabilities Plan Name [Axis] Plan Name [Axis] Derivative liability, measurement input Derivative Liability, Measurement Input Series D Series D Preferred Stock [Member] Outstanding principle Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding Schedule of Stock Based Compensation Included in Consolidated Statements of Operations Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Change In Assumptions [Domain] Change In Assumptions [Domain] Represents different levels of changes in fair value assumptions. General and Administrative General and Administrative Expense Interest rate (as a percent) Loans Held-For-Sale Or Securitization Or Asset-Backed Financing Arrangement, Stated Rate Loans Held-For-Sale Or Securitization Or Asset-Backed Financing Arrangement, Stated Rate 2015 Stock Plan and 2025 Stock Option Plan Two Thousand Fifteen Stock Option And Two Thousand Twenty Five Stock Option Plan [Member] Two Thousand Fifteen Stock Option And Two Thousand Twenty Five Stock Option Plan Securtization Trust PMT 2023-1 Securtization Trust PMIT 2023-1 [Member] Securtization Trust PMIT 2023-1 Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Borrower Loans sold to third parties Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Return of Convertible Preferred Stock from investor (Note 13) (in shares) Return of convertible preferred stock (in shares) Temporary Equity, Shares, Return of Convertible Preferred Stock From Investor Temporary Equity, Shares, Return of Convertible Preferred Stock From Investor Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Options vested and expected to vest (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 2024-1, Class B Notes Securtization Trust PMIT 2024-1, Class B Notes [Member] Securtization Trust PMIT 2024-1, Class B Notes Personal Loan Consumer Finance Segment [Member] Consumer Finance Segment Income Taxes Income Tax Disclosure [Text Block] Other, Net Other Noncash Income (Expense) Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Directors (excluding executive officers and management) Director [Member] Contributions of Borrower Loans from Parent (Note 4) Contribution of Borrower Loans From Parent Contribution of Borrower Loans From Parent Borrower Loans sold to third parties Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Sales Member’s Equity General Partner [Member] Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Entity Address, Address Line Two Entity Address, Address Line Two Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Derivative liability Derivative Liability Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Income Tax Expense Income tax expense Income Tax Expense (Benefit) Percentage of loan purchased (as a percent) Percentage Of Loan Purchased Risks and Uncertainties [Abstract] Fixed interest rate, maximum (as a percent) Fixed Interest Rate Maximum Numerator: Net Income (Loss) Attributable to Parent [Abstract] VIE, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Total Interest Income, Net Segment Adjusted EBITDA Interest Income (Expense), Net Segment Adjusted EBITDA Interest Income (Expense), Net Unamortized debt issuance costs Unamortized Debt Issuance Expense Maturity term two, in months Continuing Involvement With Transferred Financial Assets Original Term, Two Continuing Involvement With Transferred Financial Assets Original Term, Two Statement [Table] Statement [Table] Cash proceeds Proceeds from Stock Options Exercised Restricted Cash - Certificates of Deposit Certificates of Deposit [Member] Common and preferred stock, shares authorized (in shares) Common And Preferred Stock Shares Authorized Interest income on cash and cash equivalents Investment Income, Interest Convertible Preferred Stock Warrant Liability Mandatorily Redeemable Preferred Stock [Member] Impact of interest rates on fair value of loans held in consolidated trusts Impact Of Fluctuations In Market Interest Rates, Revenues Impact Of Fluctuations In Market Interest Rates, Revenues Derivative Instruments and Hedging Activities Disclosure [Abstract]