v3.26.3
Fair Value of Assets and Liabilities - Schedule of Additional Information for Level 3 Fair Value Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Servicing Assets        
Beginning balance     $ 17,402  
Ending balance $ 21,382   21,382  
Series F convertible preferred stock warrants        
Liabilities        
Change in fair value (48) $ 30,500 (44,500) $ 32,300
Convertible Preferred Stock | Series E-1 And Series F Convertible Preferred Stock        
Liabilities        
Reclassification to Convertible Preferred Stock upon exercise of Series E-1 and F Warrants (Note 13)     (171,356)  
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)   (73,292)   (73,292)
Prosper Funding LLC        
Servicing Assets        
Beginning balance     17,601  
Ending balance 21,382   21,382  
Servicing Assets        
Servicing Assets        
Beginning balance     17,402  
Ending balance 21,382   21,382  
Servicing Assets | Prosper Funding LLC        
Servicing Assets        
Beginning balance     17,601  
Ending balance 21,382   21,382  
Level 3 Inputs        
Servicing Assets        
Beginning balance     17,402  
Ending balance 21,382   21,382  
Level 3 Inputs | Credit Card Derivative | Derivative        
Credit Card Derivative        
Beginning balance, Assets 56,027 36,443 48,290 38,739
Change in fair value (27,194) 4,541 (19,457) 2,245
Ending balance, Assets 28,833 40,984 28,833 40,984
Level 3 Inputs | Prosper Funding LLC        
Servicing Assets        
Beginning balance     17,601  
Ending balance 21,382   21,382  
Level 3 Inputs | Servicing Assets        
Servicing Assets        
Beginning balance 19,659 14,438 17,402 13,718
Additions 5,504 3,517 14,510 9,703
Less: Changes in fair value (3,781) (1,257) (10,530) (6,723)
Ending balance 21,382 16,698 21,382 16,698
Level 3 Inputs | Servicing Assets | Prosper Funding LLC        
Servicing Assets        
Beginning balance 19,754 14,780 17,601 14,333
Additions 5,504 3,517 14,510 9,703
Less: Changes in fair value (3,876) (1,322) (10,729) (7,061)
Ending balance 21,382 16,975 21,382 16,975
Level 3 Inputs | Credit Card Servicing Obligation Liability        
Liabilities        
Beginning balance 10,001 7,964 9,276 8,947
Change in fair value (5,273) (612) 4,548 (371)
Ending balance 4,728 8,576 4,728 8,576
Level 3 Inputs | Convertible Preferred Stock Warrant Liability        
Liabilities        
Beginning balance 696 263,382 230,060 261,249
Change in fair value (48) 35,121 (58,056) 37,254
Ending balance 648 225,211 648 225,211
Level 3 Inputs | Loan Trailing Fee Liability        
Liabilities        
Beginning balance 3,710 3,129 3,328 3,004
Issuances 901 651 2,416 1,822
Cash Payment of Loan Trailing Fee (765) (676) (2,190) (1,969)
Change in fair value 151 136 443 383
Ending balance 3,997 3,240 3,997 3,240
Level 3 Inputs | Loan Trailing Fee Liability | Prosper Funding LLC        
Liabilities        
Beginning balance 3,710 3,129 3,328 3,004
Issuances 901 651 2,416 1,822
Cash Payment of Loan Trailing Fee (765) (676) (2,190) (1,969)
Change in fair value 151 136 443 383
Ending balance $ 3,997 $ 3,240 $ 3,997 $ 3,240