v3.26.3
Commitments and Contingencies (Details)
 3 Months Ended 9 Months Ended
Mar. 23, 2026
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Commitments And Contingencies [Line Items]            
Fee deposits, percentage (as a percent) 0.05     0.05    
Fee deposits refund obligation, issued   $ 6,400,000 $ 4,700,000 $ 18,000,000.0 $ 11,300,000  
Fee deposits refunds   13,900,000   13,900,000   $ 17,200,000
Purchase commitment of borrower loans   31,300,000   31,300,000    
Maximum potential future payments   4,400,000,000   4,400,000,000    
Accrued repurchase and indemnification obligation   300,000   300,000   300,000
Prosper Funding LLC            
Commitments And Contingencies [Line Items]            
Designated amount for loans (less than), through February 2027   100,000   100,000    
Minimum fee, remainder of fiscal year 2026   300,000   300,000    
Minimum fee, 2027   1,200,000   1,200,000    
Minimum Fee, 2028   1,200,000   1,200,000    
Minimum fee, 2029   100,000   100,000    
Minimum liquidity covenant   15,000,000.0   $ 15,000,000.0    
Fee deposits, percentage (as a percent)       0.05    
Fee deposits refunds   13,900,000   $ 13,900,000   17,200,000
Purchase commitment of borrower loans   31,300,000   31,300,000    
Maximum potential future payments   4,400,000,000   4,400,000,000    
Accrued repurchase and indemnification obligation   $ 300,000   $ 300,000   $ 300,000