v3.26.1
Fair Value of Assets and Liabilities - Schedule of Additional Information for Level 3 Fair Value Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Servicing Assets        
Beginning balance     $ 17,402  
Ending balance $ 19,659   19,659  
Series F convertible preferred stock warrants        
Liabilities        
Change in fair value 5,900 $ 49,800 (44,500) $ 1,800
Convertible Preferred Stock | Series F convertible preferred stock warrants        
Liabilities        
Reclassification to Convertible Preferred Stock upon exercise of Series E-1 and F Warrants (Note 13) (90,360)   (171,356)  
Prosper Funding LLC        
Servicing Assets        
Beginning balance     17,601  
Ending balance 19,754   19,754  
Servicing Assets        
Servicing Assets        
Beginning balance     17,402  
Ending balance 19,659   19,659  
Servicing Assets | Prosper Funding LLC        
Servicing Assets        
Beginning balance     17,601  
Ending balance 19,754   19,754  
Level 3 Inputs        
Servicing Assets        
Beginning balance     17,402  
Ending balance 19,659   19,659  
Level 3 Inputs | Credit Card Derivative | Derivative        
Credit Card Derivative        
Beginning balance, Assets 52,718 36,903 48,290 38,739
Changes in fair value 3,309 (460) 7,737 (2,296)
Ending balance, Assets 56,027 36,443 56,027 36,443
Level 3 Inputs | Prosper Funding LLC        
Servicing Assets        
Beginning balance     17,601  
Ending balance 19,754   19,754  
Level 3 Inputs | Servicing Assets        
Servicing Assets        
Beginning balance 18,421 13,456 17,402 13,718
Additions 4,743 3,418 9,006 6,186
Less: Changes in fair value (3,505) (2,436) (6,749) (5,466)
Ending balance 19,659 14,438 19,659 14,438
Level 3 Inputs | Servicing Assets | Prosper Funding LLC        
Servicing Assets        
Beginning balance 18,561 13,911 17,601 14,333
Additions 4,743 3,418 9,006 6,186
Less: Changes in fair value (3,550) (2,549) (6,853) (5,739)
Ending balance 19,754 14,780 19,754 14,780
Level 3 Inputs | Credit Card Servicing Obligation Liability        
Liabilities        
Beginning balance 9,276 8,433 9,276 8,947
Change in fair value 725 (469) 725 (983)
Ending balance 10,001 7,964 10,001 7,964
Level 3 Inputs | Convertible Preferred Stock Warrant Liability        
Liabilities        
Beginning balance 85,115 204,023 230,060 261,249
Change in fair value 5,941 59,359 (58,008) 2,133
Ending balance 696 263,382 696 263,382
Level 3 Inputs | Trailing Fee        
Liabilities        
Beginning balance 3,491 2,933 3,328 3,004
Issuances 806 650 1,514 1,172
Cash Payment of Loan Trailing Fee (715) (641) (1,424) (1,293)
Change in fair value 128 187 292 246
Ending balance 3,710 3,129 3,710 3,129
Level 3 Inputs | Trailing Fee | Prosper Funding LLC        
Liabilities        
Beginning balance 3,491 2,933 3,328 3,004
Issuances 806 650 1,514 1,172
Cash Payment of Loan Trailing Fee (715) (641) (1,424) (1,293)
Change in fair value 128 187 292 246
Ending balance $ 3,710 $ 3,129 $ 3,710 $ 3,129