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Fair Value Measurements - Significant Unobservable Units (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt securities available-for-sale $ 2,129 $ 2,079 $ 2,078 $ 2,502 $ 2,468 $ 3,000
Derivative liability 0 $ 1,932 3,513 $ 3,030 $ 4,305 $ 8,108
Level 3            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Debt securities available-for-sale $ 2,129   $ 2,078      
Discounted cash flow | Alternative asset market discount rate            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     0.10      
Discounted cash flow | Equity market risk premiums            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     0.07      
Discounted cash flow | Enhanced return discount rate            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     0.12      
Minimum | Market Approach | Level 3 | Enterprise value-to-revenue multiple            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs 0.2   0.2      
Minimum | Discounted cash flow | Alternative asset beta to equity markets            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     0.42      
Minimum | Discounted cash flow | Distribution rate            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     0.03      
Minimum | Discounted cash flow | Net asset value volatilities            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     0.09      
Maximum | Market Approach | Level 3 | Enterprise value-to-revenue multiple            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs 18.9   18.9      
Maximum | Discounted cash flow | Alternative asset beta to equity markets            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     1.67      
Maximum | Discounted cash flow | Distribution rate            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     0.06      
Maximum | Discounted cash flow | Net asset value volatilities            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs     0.84      
Weighted Average | Market Approach | Level 3 | Enterprise value-to-revenue multiple            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Unobservable Inputs 1.80   1.74