v3.26.3
Borrower Loans and Notes, at Fair Value - Additional Information (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Non accrual status past due date (in days)   120 days
Borrower Loans, at Fair Value $ 215,711 $ 309,737
Prosper Funding LLC    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Borrower Loans, at Fair Value $ 215,711 $ 245,337
Borrower Loans    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Maturity, in months 24 months 24 months
Maturity term two, in months 36 months 36 months
Maturity term three, in months 48 months 48 months
Maturity term four, in months 60 months 60 months
Fixed interest rate, minimum (as a percent) 6.30% 6.00%
Fixed interest rate, maximum (as a percent) 33.00% 33.00%
Minimum number of days for which loans originated were delinquent (in days) 90 days 90 days
Fair value of loans originated $ 300 $ 600
Loans in non-accrual status 300 400
Aggregate outstanding loan principal 227,393 324,505
Borrower Loans, at Fair Value $ 215,711 $ 309,737
Borrower Loans | Prosper Funding LLC    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Maturity term one, in months 24 months 24 months
Maturity term two, in months 36 months 36 months
Maturity term three, in months 48 months 48 months
Maturity term four, in months 60 months 60 months
Fixed interest rate, minimum (as a percent) 6.30% 6.00%
Fixed interest rate, maximum (as a percent) 33.00% 33.00%
Minimum number of days for which loans originated were delinquent (in days) 90 days 90 days
Fair value of loans originated $ 300 $ 400
Non accrual status past due date (in days)   120 days
Loans in non-accrual status 300 $ 300
Aggregate outstanding loan principal 227,393 255,132
Borrower Loans, at Fair Value 215,711 245,337
Borrower Loans | Prosper Funding LLC | PMIT 2023-1 And PMIT 2024-1    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Aggregate outstanding loan principal 3,900  
Borrower Loans, at Fair Value 1,600  
Borrower Loans | 90 days or More Past Due    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Aggregate principal amount 1,500 2,900
Borrower Loans | 90 days or More Past Due | Prosper Funding LLC    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Aggregate principal amount $ 1,500 $ 2,200