v3.26.1
FAIR VALUE OF ASSETS AND LIABILITIES - Schedule of Servicing Assets, Credit Card Derivative, and Convertible Preferred Stock Warrant Liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Servicing Assets    
Beginning balance, fair value $ 13,718  
Ending balance, fair value 17,402 $ 13,718
Series F Convertible Preferred Stock warrants    
Convertible Preferred Stock Warrant Liability    
Change in fair value (36,100) (39,100)
Convertible Preferred Stock | Series F Convertible Preferred Stock warrants    
Convertible Preferred Stock Warrant Liability    
Reclassification to Convertible Preferred Stock upon exercise of Series F Warrants (Note 13) (73,292)  
Prosper Funding LLC    
Servicing Assets    
Beginning balance, fair value 14,333  
Ending balance, fair value 17,601 14,333
Servicing Assets    
Servicing Assets    
Beginning balance, fair value 13,718  
Ending balance, fair value 17,402 13,718
Servicing Assets | Prosper Funding LLC    
Servicing Assets    
Beginning balance, fair value 14,333  
Ending balance, fair value 17,601 14,333
Level 3 Inputs    
Servicing Assets    
Beginning balance, fair value 13,718  
Ending balance, fair value 17,402 13,718
Level 3 Inputs | Mandatorily Redeemable Preferred Stock    
Convertible Preferred Stock Warrant Liability    
Beginning balance, fair value 261,249 215,041
Change in fair value 42,103 46,208
Ending balance, fair value 230,060 261,249
Level 3 Inputs | Credit Card Derivative (Note 5) | Derivative    
Credit Card Derivative    
Beginning balance, Assets 38,739 36,848
Change in fair value 9,551 13,335
Reduction to fair value upon PMCC 2024-1 securitization (Notes 5 and 7)   (11,444)
Ending balance, Assets 48,290 38,739
Level 3 Inputs | Credit Card Servicing Obligation Liability    
Credit Card Derivative    
Reduction to fair value upon PMCC 2024-1 securitization (Notes 5 and 7)   (2,846)
Convertible Preferred Stock Warrant Liability    
Beginning balance, fair value 8,947 9,732
Change in fair value 329 2,061
Ending balance, fair value 9,276 8,947
Level 3 Inputs | Prosper Funding LLC    
Servicing Assets    
Beginning balance, fair value 14,333  
Ending balance, fair value 17,601 14,333
Level 3 Inputs | Servicing Assets    
Servicing Assets    
Beginning balance, fair value 13,718 12,249
Additions 13,609 10,997
Less: Change in fair value (9,925) (9,528)
Ending balance, fair value 17,402 13,718
Level 3 Inputs | Servicing Assets | Prosper Funding LLC    
Servicing Assets    
Beginning balance, fair value 14,333 13,818
Additions 13,609 10,997
Less: Change in fair value (10,341) (10,482)
Ending balance, fair value $ 17,601 $ 14,333