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Investments, at Fair Value - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 27, 2022
USD ($)
Apr. 01, 2022
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
investmentFund
underlyingInvestment
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
investmentFund
underlyingInvestment
Dec. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Distribution proceeds           $ 19,322,000 $ 38,371,000  
Alternative investment funds | investmentFund       222   222    
Underlying investments | underlyingInvestment       749   749    
Percent of underlying investments in private companies       93.00%   93.00%    
Notational amount of put options   $ 141,300,000            
Proceeds from sale of put options by Ben     $ 1,000,000     $ 0 968,000  
Loss on financial instruments, net       $ (523,000) $ (18,024,000) (1,885,000) (64,260,000)  
Investments       334,278,000   334,278,000   $ 329,119,000
Noncredit-related portion of net unrealized gains (losses)       (120,000) 51,000 (115,000) 4,236,000  
Other comprehensive income (loss), reclassification adjustment from AOCI for transfer of securities, net of tax             13,694,000  
Credit-related loss on investment in debt securities available-for-sale       0 0 1,000,000.0 0  
Equity securities without readily determinable fair value       26,900,000   26,900,000   26,800,000
Equity impairment loss       0 0 0 0  
Put options                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Loss on financial instruments, net     $ (700,000) 0 $ 0 0 (3,023,000)  
Investments       0   0   0
Ben                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Equity securities without readily determinable fair value       0   0   6,000
Ben | Put options                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Loss on financial instruments, net             $ (2,000,000.0)  
CT Risk Management, L.L.C.                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Purchase of put options   $ 5,000,000            
Proceeds from equity interest $ 2,400,000              
Class A common stock, par value $0.001 per share | Other Public Companies                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Fair value of common stock       $ 4,500,000   $ 4,500,000   4,900,000
Wind Down Trust | GWG Holdings                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Fair value of common stock               $ 600,000