Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] 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 Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Credit Card Credit Card Segment [Member] Credit Card Segment Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Default rate decrease Default Rate Decrease Segment Reporting [Abstract] 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 Interest Earned on Notes Interest Income, Interest-Earning Asset Maximum potential future payments Guarantor Obligations, Maximum Exposure, Undiscounted Borrower Loans, Aggregate principal balance and interest outstanding Loans Receivable Carrying Value Derivative Instrument [Axis] Derivative Instrument [Axis] Minimum percentage of stockholders considered for related parties (as a percent) Minimum Percentage Of StockHolders Engaged In Various Transactions As Related Party Servicing Assets Servicing Assets Beginning balance Ending balance Servicing Asset at Fair Value, Amount Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Exercise of warrant (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Default rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Credit Losses Consolidated Entities [Axis] Consolidated Entities [Axis] Securitization Trust PMCC 2024-1 Securitization Trust PMCC 2024-1 [Member] Securitization Trust PMCC 2024-1 Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Conversion ratio Conversion Ratio Of Preferred Stock Into Prosper Common Stock Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Change in Fair Value of Convertible Preferred Stock Warrants Aggregate fair value of warrants Fair Value Adjustment of Warrants Leases [Abstract] Related Parties Related Party Transactions Disclosure [Text Block] Consolidated Entities [Domain] Consolidated Entities [Domain] Maturity, in months Continuing Involvement With Transferred Financial Assets Original Term Options issued (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Credit Card receivables Credit Card Receivables Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Net Carrying Value Operating Lease, Right-Of-Use Asset, Net Operating Lease, Right-Of-Use Asset, Net Unvested, beginning balance (in shares) Unvested, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Securtization Trust PMCC 2024-1, Class A Notes Securtization Trust PMCC 2024-1, Class A Notes [Member] Securtization Trust PMCC 2024-1, Class A Notes Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Change in Fair Value of Financial Instruments Change in Fair Value of Financial Instruments, Net Change In Fair Value Of Borrower Loans Loans Held For Sale And Notes Changes in fair value Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Change In Fair Value Number of reporting segments Number of Reportable Segments Concentration Risk [Table] Concentration Risk [Table] Entity Address, City or Town Entity Address, City or Town Market servicing rate increase of 0.025% Market Servicing Rate Increase To 2.5 Basis Points [Member] Market Servicing Rate Increase To 2.5 Basis Points Change In Assumptions [Axis] Change In Assumptions [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Applying a 1.2 multiplier to default rate One Point Two Multiplier To Prepayment Rate [Member] One Point Two Multiplier To Prepayment Rate Level 2 Inputs Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Change in fair value of servicing liability increase (decrease) Servicing Liability at Fair Value, Period Increase (Decrease) Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] 90 days or More Past Due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Maturity term four, in months Continuing Involvement With Transferred Financial Assets Original Term Four Continuing Involvement With Transferred Financial Assets Original Term Four Less: Changes in fair value Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Market servicing rate Market Servicing Rate [Member] Market Servicing Rate Schedule of Segment Reporting Information, by Segment Segment Reporting [Table Text Block] Related Party [Axis] Related and Nonrelated Parties [Axis] Schedule of Level 3 Liabilities Measured on Recurring Basis Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of Future Minimum Lease Payments Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Document Period End Date Document Period End Date Prosper Funding LLC Subsidiaries [Member] Face amount Debt Instrument, Face Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Remaining contractual term (in years) Debt Instrument, Term Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Entity Shell Company Entity Shell Company Minimum fee, 2026 Borrowers Loans Origination, Minimum Fee, Year One Change in fair value Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Loan trailing fee liability Obligations [Member] Gain on Sale of Borrower Loans Gain on Sale of Borrower Loans Gain (Loss) on Sales of Consumer Loans Net Income (Loss) Per Share Earnings Per Share [Text Block] Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Temporary Equity Component [Domain] Temporary Equity Component [Domain] Temporary Equity Component Total Liabilities Total Liabilities Liabilities Partner Type [Axis] Partner Type [Axis] Discount rate Measurement Input, Discount Rate [Member] Purchases of Property and Equipment Payments to Acquire Property, Plant, and Equipment Market servicing rate increase of 0.10% 10 Basis Point Increase [Member] 10 Basis Point Increase Contractually specified servicing fees, late charges and ancillary fees Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset Company Selected Measure Name Company Selected Measure Name Purchases of Credit Card Receivables from Credit Card Partner Payments to Acquire Debt Securities, Available-for-Sale Income Tax Disclosure [Abstract] Fair Value of Assets and Liabilities Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Receivable from Credit Card Partner, at Fair Value Receivable from Credit Card Partner, at Fair Value (Notes 5 and 7) Fair value, using the following assumptions: Accounts Receivable from Securitization Change in Fair Value of Servicing Rights Change in Fair Value of Servicing Rights Amortization And Change In Fair Value Servicing Rights Amortization and change In fair value of servicing rights. Concentration Risk [Line Items] Concentration Risk [Line Items] 2023-1, Class C Notes Securtization Trust PMIT 2023-1, Class C Notes [Member] Securtization Trust PMIT 2023-1, Class C Notes Depreciation and Amortization Depreciation and Amortization Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Loans in non-accrual status Financing Receivable, Nonaccrual Applying a 1.2 multiplier to default rate One Point Two Multiplier To Default Rate [Member] One Point Two Multiplier To Default Rate Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Entities [Table] Entities [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Receivable From Credit Card Partner Receivable From Credit Card Partner [Member] Receivable From Credit Card Partner Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash Paid for Operating Leases Included in the Measurement of Lease Liabilities Operating Lease, Payments Award Timing Predetermined Award Timing Predetermined [Flag] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Inputs Fair Value, Inputs, Level 1 [Member] Net effective tax rate Effective Income Tax Rate Reconciliation, Percent Goodwill, period increase (decrease) Goodwill, Period Increase (Decrease) Borrower Loans and Notes Fair Value of Financial Instruments, Policy [Policy Text Block] Stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Securitization amount Loan, Securitized or Asset-Backed Financing Arrangement, Principal Outstanding 2024-1, Class B Notes Securtization Trust PMIT 2024-1, Class B Notes [Member] Securtization Trust PMIT 2024-1, Class B Notes Purchase of Convertible Preferred Stock and Common Stock by consolidated VIE Prosper Grantor Trust (Note 13) Stock Repurchased and Retired During Period, Value 200 basis point incease Two Hundred Basis Point Increase Member Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Other Liabilities Other Liabilities Disclosure [Text Block] Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Operating lease, right-of-use asset Gross Carrying Value Operating Lease, Right-of-Use Asset Securtization Trust PMT 2023-1 Securtization Trust PMIT 2023-1 [Member] Securtization Trust PMIT 2023-1 Schedule of Shares Authorized, Issued, Outstanding, Par Value and Liquidation Preference of Convertible Preferred Stock Temporary Equity [Table Text Block] Renewal term (in years) Lessee, Operating Lease, Renewal Term Fair Value Disclosures [Abstract] Liabilities Liability At Fair Value, Amount [Roll Forward] Liability At Fair Value, Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Expiration Date Trading Arrangement Expiration Date Restricted Cash Restricted Cash Restricted Cash and Cash Equivalent Valuation techniques Derivative Asset, Measurement Input Minimum liquidity covenant Minimum Liquidity Covenant Options vested and exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Default rate Measurement Input, Default Rate [Member] Derivative [Table] Derivative [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Unrecognized cost of unvested share-based compensation awards. Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 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 Segments [Domain] Segments [Domain] Series E-1 convertible preferred stock warrants Series E1 Convertible Preferred Stock Warrants Member Schedule of Derivative Assets Measured at Fair Value Schedule of Derivative Assets Measured at Fair Value [Table Text Block] Schedule of Derivative Assets Measured at Fair Value Debt Debt Disclosure [Text Block] Convertible preferred stock issued and outstanding, excluding shares held by consolidated VIE Convertible Preferred Stock [Member] Debt issuance costs, net Debt Issuance Costs, Net PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Percentage of fund from whole loan channel Percentage Of Fund From Whole Loan Channel Percentage Of Fund From Whole Loan Channel Gain (loss) on embedded derivatives Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Outstanding Credit Card Principal Balance, Prosper and Coastal Allocations Cash Equivalent, Credit and Debit Card Receivables, Carrying Value Total Stockholders' Deficit Beginning balance Ending balance Equity, Attributable to Parent Other tax expense (benefit) Other Tax Expense (Benefit) Assets: Assets: Assets [Abstract] 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. 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 Insider Trading Policies and Procedures [Line Items] Loans Held For Sale Loans Held For Sale Member Property, plant, and equipment, addition Property, Plant, and Equipment, before Accumulated Depreciation, Addition Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Dividend yield Measurement Input, Expected Dividend Rate [Member] Number of operating segments Number of Operating Segments Total common stock equivalents excluded from diluted net income (loss) per common share computation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Central Index Key Entity Central Index Key Less: accumulated depreciation and amortization Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional Paid-In Capital Additional Paid in Capital, Common Stock Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Change in Fair Value of Financial Instruments Change in Fair Value of Financial Instruments, Net Change In Fair Value Of Financial Instruments Change In Fair Value Of Financial Instruments Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Series G Series G Preferred Stock [Member] Schedule of Fair Value of Stock Option Awards Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Series A Series A Convertible Preferred Stock [Member] Series A Convertible Preferred Stock Times the original issue Number Of Times Shareholders Are Entitled To Receive Original Issue Price 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 Common stock warrants (in shares) Incremental Common Shares Attributable To Dilutive Effect of Warrants Incremental Common Shares Attributable To Dilutive Effect of Warrants All Individuals All Individuals [Member] Maturity term three, in months Continuing Involvement With Transferred Financial Assets Original Term Three Continuing Involvement With Transferred Financial Assets Original Term Three Management Management [Member] Operating lease right-of-use assets Assets Held Under Operating Leases [Member] Assets Held Under Operating Leases Assets Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Statement [Line Items] Statement [Line Items] Total Assets Assets Schedule of Lease Maturity Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Collection fee market rate Fair Value Assumptions, Collection Fee Market Rate Fair Value Assumptions, Collection Fee Market Rate Common stock, capital shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Contractual threshold Loans Held-For-Sale Or Securitization Or Asset-Backed Financing Arrangement, Contractual Threshold Loans Held-For-Sale Or Securitization Or Asset-Backed Financing Arrangement, Contractual Threshold Aggregate Amount of Notes Purchased Aggregate Amount Of Notes And Borrower Loans Purchased By Related Parties Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Reclassification to Convertible Preferred Stock upon exercise of Series E-1 and F Warrants (Note 13) Temporary Equity, Stock Issued During Period Value Conversion Of Convertible Securities, Warrant Temporary Equity, Stock Issued During Period Value Conversion Of Convertible Securities, Warrant 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 Prosper Allocations Prosper Allocations [Member] Prosper Allocations Payable to Investors Increase Decrease In Payable To Investors 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 Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Net Income (Loss) Per Share - Diluted (in dollars per share) Earnings Per Share, Diluted Prepaid and Other Assets Increase (Decrease) in Prepaid Expense and Other Assets Weighted-average market servicing rate Fair Value Assumptions, Weighted Average Market Servicing Rate Fair Value Assumptions, Weighted Average Market Servicing Rate Stockholders' Equity Note [Abstract] Applying a 1.1 multiplier to default rate One Point One Multiplier To Default Rate [Member] Temporary Equity Component [Axis] Temporary Equity Component [Axis] Temporary Equity Component Share-Based Payment Arrangement [Abstract] Revenues Revenue from Contract with Customer, Excluding Assessed Tax Consolidated Entity, Excluding Consolidated VIE Consolidated Entity, Excluding Consolidated VIE [Member] Transaction Fee Refunds Transaction Fee Refunds [Policy Text Block] Transaction Fee Refunds Applying a 0.9 multiplier to prepayment rate Applying a 0.9 multiplier to prepayment rate Zero Point Nine Multiplier To Prepayment Rate [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Related Party Two Related Party Two [Member] Related Party Two Interest payable Increase (Decrease) in Interest Payable, Net Borrower Loans sold to third parties Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Administration Fee Expense – Related Party Related Parties Amount in Cost of Sales Assumptions [Axis] Assumptions [Axis] 2024-1, Class D Notes Securtization Trust PMIT 2024-1, Class D Notes [Member] Securtization Trust PMIT 2024-1, Class D Notes Securtization Trust PMCC 2024-1, Class B Notes Securtization Trust PMCC 2024-1, Class B Notes [Member] Securtization Trust PMCC 2024-1, Class B Notes Debt instrument, upsize option Debt Instrument, Credit Facility Upsize Option Amount Debt Instrument, Credit Facility Upsize Option Amount Cash flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Gain (loss) on settled transactions Derivative, Gain (Loss) on Derivative, Net Schedule of Fair Value Assumptions Key Economic Assumptions And Sensitivity Of Current Fair Value To Immediate Adverse Changes In Those Assumptions [Table Text Block] Member's Equity Members' Equity Default rate increase Default Rate Increase Cashless exercise of common stock warrants (Note 13) (in shares) Cashless exercise of common stock warrants (in shares) Stock Issued During Period, Shares, Cashless Warrant Exercise Stock Issued During Period, Shares, Cashless Warrant Exercise Notes, at Fair Value Notes, at Fair value Notes Payable, Fair Value Disclosure Servicing Assets: Servicing Assets [Abstract] Servicing Assets Related Party Three Related Party Three [Member] Related Party Three Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Common stock, issued (in shares) Common Stock, Shares, Issued Number of votes per share Common Stock, Voting Rights, Per Common Share, Number Of Votes Common Stock, Voting Rights, Per Common Share, Number Of Votes Decrease in Credit servicing obligation Derivative Liability, Decrease in Fair Value With Change In Assumptions Derivative Liability, Decrease in Fair Value With Change In Assumptions Beginning balance, Assets Ending balance, Assets Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Entity Information [Line Items] Entity Information [Line Items] Expected fair value with change in assumptions Servicing Assets And Servicing Liabilities, Expected Fair Value With Change In Assumptions Servicing Assets And Servicing Liabilities, Expected Fair Value With Change In Assumptions Term Loan (Note 11) Loans Payable Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Notes Notes Payable Expected Fair Value With Change In Assumptions Assumptions [Domain] Assumptions [Domain] Represents different classes of fair value assumptions. Deferred income tax liability Deferred Income Tax Liabilities, Net Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Maturity term two, in months Continuing Involvement With Transferred Financial Assets Original Term, Two Continuing Involvement With Transferred Financial Assets Original Term, Two Marketing and Advertising Marketing and Advertising Expense 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Borrower Loans, Fair value adjustment Assets, Fair Value Adjustment Termination Date Trading Arrangement Termination Date Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Stock split conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Purchases of Credit Card principal receivables Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Other Liabilities [Abstract] Fair Value as of Grant Date Award Grant Date Fair Value Minimum fee, 2027 Borrowers Loans Origination, Minimum Fee, Year Three Borrowers Loans Origination, Minimum Fee, Year Three Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Liquidation preference (in dollars per share) Temporary Equity, Liquidation Preference Per Share Fair value of loans originated Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Fair value of stock option awards [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] 2023-1, Class A Notes Securtization Trust PMIT 2023-1, Class A Notes [Member] Securtization Trust PMIT 2023-1, Class A Notes Transaction fee cap percentage (as a percent) Transaction Fee Cap Percentage Transaction Fee Cap Percentage Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total Net Revenue Total Net Revenue Revenues Accounts Payable and Accrued Liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Other Non-Cash Changes in Borrower Loans and Notes Other Non Cash Changes In Borrower Loans And Notes Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Options expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Convertible preferred stock Beginning balance Ending balance Temporary Equity, Carrying Amount, Attributable to Parent Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Equity Award [Domain] Award Type [Domain] Remainder of 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Borrower Loans and Notes, at Fair Value Fair Value Disclosures [Text Block] Level 3 Inputs Fair Value, Inputs, Level 3 [Member] Expected life (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Operating lease contract term (in years) Lessee, Operating Lease, Term of Contract Deferred revenue Contract with Customer, Liability Derivative liability, expected fair value with change in assumptions Derivative Liability, Expected Fair Value With Change In Assumptions Derivative Liability, Expected Fair Value With Change In Assumptions Other Assets Other Assets Legal Entity [Axis] Legal Entity [Axis] Interest Expense on Financial Instruments Interest Expense on Notes Interest Expense, Debt Liability Class [Axis] Liability Class [Axis] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Property and Equipment, Net Total Property and Equipment, Net Property, Plant, And Equipment And Operating Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization Property, Plant, And Equipment And Operating Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization Cash, Cash Equivalents and Restricted Cash at Beginning of the Period Cash, Cash Equivalents and Restricted Cash at End of the Period Total Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-NEOs Non-NEOs [Member] Accumulated Amortization Operating Lease, Right-Of-Use Asset, Accumulated Amortization Operating Lease, Right-Of-Use Asset, Accumulated Amortization Change in Fair Value of Convertible Preferred Stock Warrants Change in Fair Value of Convertible Preferred Stock Warrants Change In Fair Value Of Convertible Preferred Stock Warrants Number of classes issued Loans Held-For-Sale Or Securitization Or Asset-Backed Financing Arrangement Number of Classes Issued Loans Held-For-Sale Or Securitization Or Asset-Backed Financing Arrangement Number of Classes Issued Property and equipment Property, Plant, And Equipment And Operating Lease Right-Of-Use Assets Property, Plant, And Equipment And Operating Lease Right-Of-Use Assets Percentage of loan purchased (as a percent) Percentage Of Loan Purchased Customer [Domain] Customer [Domain] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type Long-Term Debt, Type [Domain] Risk-free interest rate Measurement Input, Risk Free Interest Rate [Member] Range [Axis] Statistical Measurement [Axis] Fee deposits, percentage (as a percent) Fee Deposits, Excess Of Transaction Fee Collected, Percentage Fee Deposits, Excess Of Transaction Fee Collected, Percentage Exercise of vested stock options Stock Issued During Period Value Vested Stock Options Exercised Stock issued during period value vested stock options exercised. Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Table] Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table] Return of Convertible Preferred Stock from investor (Note 13) Adjustments To Additional Paid In Capital, Return of Convertible Preferred Stock From Investor Adjustments To Additional Paid In Capital, Return of Convertible Preferred Stock From Investor Office equipment and furniture Office Equipment And Furniture Member Award Type [Axis] Award Type [Axis] Payments of Notes, at Fair Value Payment Of Notes Held At Fair Value Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Other Other Sundry Liabilities Accumulated Deficit Accumulated Deficit Retained Earnings (Accumulated Deficit) Purchase of convertible preferred stock by consolidated VIE Prosper Grantor Trust (in shares) Temporary Equity, Stock Purchased During Period, Shares Temporary Equity, Stock Purchased During Period, Shares Product and Service [Axis] Product and Service [Axis] Common and preferred stock, shares authorized (in shares) Common And Preferred Stock Shares Authorized Maturity term five, in months Continuing Involvement With Transferred Financial Assets Original Term Five Continuing Involvement With Transferred Financial Assets Original Term Five Default rate assumption Fair Value Assumptions Default Rate Member Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Schedule of Operating Lease Right-of-Use Assets Lessee, Operating Lease, Schedule Of Right-Of-Use Assets [Table Text Block] Lessee, Operating Lease, Schedule Of Right-Of-Use Assets Total Interest Income, Net Segment Adjusted EBITDA Interest Income (Expense), Net Segment Adjusted EBITDA Interest Income (Expense), Net Derivative Contract [Domain] Derivative Contract [Domain] Receivable from Credit Card Partner Receivable [Policy Text Block] Total Liabilities, Convertible Preferred Stock and Stockholders' Deficit Liabilities and Equity Stock options issued and outstanding Stock options Share-Based Payment Arrangement, Option [Member] Purchases of Borrower Loans/Issuance of Notes Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Schedule of Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Other changes Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Other Changes Beginning balance, Total Ending balance, Total Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value Other Income, Net Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Property and Equipment Property, Plant and Equipment [Member] Property, Plant, and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Schedule Of Property Plant And Equipment [Table] Property, Plant, and Equipment [Table] Fair value assumptions Debt Instrument, Measurement Input Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash Paid for Interest, Net Cash Paid for Interest, Net Interest Paid, Excluding Capitalized Interest, Operating Activity Less: Net Income Allocated to Participating Securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Total Assets Assets, Fair Value Disclosure Executive officers and management Executive Officers And Management Member Name Measure Name 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 Pay vs Performance Disclosure [Line Items] Prepayment rate assumption Fair Value Assumptions Prepayment Rate Member Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] 2024-1, Class A Notes Securtization Trust PMIT 2024-1, Class A Notes [Member] Securtization Trust PMIT 2024-1, Class A Notes Debt Instrument [Line Items] Debt Instrument [Line Items] Additional Paid-In Capital Additional Paid-in Capital [Member] Credit Card servicing obligation liability (Notes 2 and 5) Servicing Liability Goodwill impairment expense Goodwill, Impairment Loss Schedule of Quantitative Information About Significant Unobservable Inputs Fair Value Inputs Assets Liabilities Quantitative Information [Table Text Block] Net Related Party Receivable/Payable Increase Decrease In Receivables From And Payables To Related Party Name Trading Arrangement, Individual Name Cash and Cash Equivalents Cash and Cash Equivalents Cash and Cash Equivalent Expected term (in years) Measurement Input, Expected Term [Member] Other changes Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Other Changes Discount rate on Coastal Program Fee Measurement Input, Discount Rate on Program Fee [Member] Measurement Input, Discount Rate on Program Fee Rental expense under operating lease arrangements Operating Lease, Expense Proceeds from sale Proceeds from Sale of Loans Receivable Company Selected Measure Amount Company Selected Measure Amount Series F convertible preferred stock warrants Series F Series F Preferred Stock [Member] Voting power (at least) (as a percent) Percentage Of Holders Of Preferred Stock Required To Request For Conversion Minimum Discount rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Administration Fee Revenue – Related Party Administration Fees Member Weighted average vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Purchase commitment of borrower loans Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability Preferred stock, liquidation preference, conversion basis, after 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Liabilities At Fair Value, Valuation Techniques Leases Lessee, Leases [Policy Text Block] Accounts Receivable Increase (Decrease) in Receivables 2023-1, Class D Notes Securtization Trust PMIT 2023-1, Class D Notes [Member] Securtization Trust PMIT 2023-1, Class D Notes Credit Card Derivative Credit Card Derivative [Abstract] Credit Card Derivative Revenues: Revenues [Abstract] Preferred stock, liquidation preference, conversion basis Preferred Stock Liquidation Preference Conversion Basis Principal payments not due period (in years) Loans Held-For-Sale Or Securitization Or Asset-Backed Financing Arrangement, Principal Payments Not Due Period Loans Held-For-Sale Or Securitization Or Asset-Backed Financing Arrangement, Principal Payments Not Due Period Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Change In Assumptions [Domain] Change In Assumptions [Domain] Represents different levels of changes in fair value assumptions. 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Fair Value of Borrower Loans and Notes Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Exercise Price Award Exercise Price Segment Reporting [Line Items] Segment Reporting [Line Items] Purchase of Loans Held for Sale, at Fair Value Payment for Purchase, Loan, Held-for-Sale Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Trailing Fee Trailing Fee [Member] Series E-1 And Series F Convertible Preferred Stock Series E-1 And Series F Convertible Preferred Stock [Member] Series E-1 And Series F Convertible Preferred Stock Market servicing rate Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Market Servicing Rate Principal Payments on Term Loan Repayments of Long-Term 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days for which loans originated were delinquent (in days) Minimum Period That Borrower Loans Were Delinquent Minimum period that borrower loans were delinquent. 100 basis point decrease One Hundred Basis Point Decrease Member 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] 10 percent increase Ten Percent Increase [Member] Ten Percent Increase Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Series E-2 Series E-2 Preferred 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Taxes Income Tax Disclosure [Text Block] Other, Net Other Noncash Income (Expense) Applying a 1.1 multiplier to prepayment rate One Point One Multiplier To Prepayment Rate [Member] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Less: Accumulated depreciation and amortization Property, Plant, And Equipment And Operating Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization Property, Plant, And Equipment And Operating Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization Directors (excluding executive officers and management) Director [Member] Origination and Servicing Origination And Servicing, Depreciation Expense Origination And Servicing, Depreciation Expense Market servicing rate decrease of 0.025% Market Servicing Rate Decrease To 2.5 Basis Points [Member] Market Servicing Rate Decrease To 2.5 Basis Points Member’s Equity General Partner [Member] Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Applying a 0.8 multiplier to default rate Zero Point Eight Multiplier To Default Rate [Member] Zero Point Eight Multiplier To Default Rate Purchase of Convertible Preferred Stock and Common Stock by consolidated VIE Prosper Grantor Trust (Note 13) Temporary Equity, Value, Purchase Of Convertible Securities Temporary Equity, Value, Purchase Of Convertible Securities Entity Address, Address Line Two Entity Address, Address Line Two Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Minimum percentage of voting securities considered for related parties (more than) (as a percent) Minimum Percentage Of Voting Securities Holders Engaged In Various Transactions As Related Party 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) Risks and Uncertainties [Abstract] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Interest Expense on Term Loan Interest Expense, Debt, Nonoperating Interest Expense, Debt, Nonoperating Plus: Return on Share Purchase and Forfeiture Return on Share Purchase and Forfeiture, Adjustment Amount Return on Share Purchase and Forfeiture, Adjustment Amount VIE, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Unamortized debt issuance costs Unamortized Debt Issuance Expense Statement [Table] Statement [Table] Borrower Loans sold to third parties Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Sales Cash proceeds Proceeds from Stock Options Exercised Restricted Cash - Certificates of Deposit Certificates of Deposit [Member] Interest income on cash and cash equivalents Investment Income, Interest Originations Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Purchases Convertible Preferred Stock Warrant Liability Mandatorily Redeemable Preferred Stock [Member] Fixed interest rate, maximum (as a percent) Fixed Interest Rate Maximum Derivative Instruments and Hedging Activities Disclosure [Abstract]