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FAIR VALUE MEASUREMENTS - Schedule of significant unobservable inputs of level 3 financial assets and liabilities (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
At Fair Value $ 24,927 $ 26,303
Total assets measured at fair value 598,404 406,931
Liability-classified warrants 11,080  
Total liabilities measured at fair value 27,913 16,209
Level 3    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
At Fair Value 24,927 26,303
Total assets measured at fair value 108,032 137,608
Liability-classified warrants 11,080  
Total liabilities measured at fair value 11,080 6,400
Level 3 | Market approach    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
At Fair Value   1,835
Level 3 | Market approach | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities $ 27,898 $ 25,572
Level 3 | Market approach | Market price of related security | Partnership interests and other investments    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 526.59 421.00
Level 3 | Market approach | Discount rate | Partnership interests and other investments    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities $ 52,650 $ 40,082
Level 3 | Market approach | Minimum | Multiple of sales | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.7 0.7
Level 3 | Market approach | Minimum | Market price of related security    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans receivable at fair value, measurement input   8.56
Level 3 | Market approach | Minimum | Market price of related security | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 10.24 2.14
Level 3 | Market approach | Minimum | Discount rate | Partnership interests and other investments    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0 0
Level 3 | Market approach | Maximum | Multiple of sales | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 6.0 6.0
Level 3 | Market approach | Maximum | Market price of related security | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 12.01 12.01
Level 3 | Market approach | Maximum | Discount rate | Partnership interests and other investments    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.037 0.035
Level 3 | Market approach | Weighted Average | Multiple of sales | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 2.3 2.3
Level 3 | Market approach | Weighted Average | Market price of related security    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans receivable at fair value, measurement input   8.56
Level 3 | Market approach | Weighted Average | Market price of related security | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 10.80 10.97
Level 3 | Market approach | Weighted Average | Market price of related security | Partnership interests and other investments    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 526.59 421.00
Level 3 | Market approach | Weighted Average | Discount rate | Partnership interests and other investments    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.005 0.005
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Liability-classified warrants $ 11,080 $ 6,400
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities $ 1,718 $ 43,101
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model | Annualized volatility    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability, measurement input 0.875 0.850
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model | Discount for lack of marketability    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability, measurement input   0.147
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model | Minimum | Annualized volatility | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 1.300 1.200
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model | Maximum | Annualized volatility | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input   1.480
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model | Weighted Average | Annualized volatility    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability, measurement input 0.875 0.850
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model | Weighted Average | Annualized volatility | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 1.300 1.210
Level 3 | Monte Carlo simulation and Black-Scholes option pricing model | Weighted Average | Discount for lack of marketability    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability, measurement input   0.147
Level 3 | Option pricing model | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities $ 839 $ 2,550
Level 3 | Option pricing model | Minimum | Annualized volatility | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.470 0.460
Level 3 | Option pricing model | Maximum | Annualized volatility | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.930 1.150
Level 3 | Option pricing model | Weighted Average | Annualized volatility | Equity securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.540 0.570
Level 3 | Discounted cash flow    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
At Fair Value   $ 24,468
Level 3 | Discounted cash flow | Loans receivable at fair value    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
At Fair Value $ 24,927  
Level 3 | Discounted cash flow | Minimum | Discount rate    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input   0.068
Level 3 | Discounted cash flow | Minimum | Discount rate | Loans receivable at fair value    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.068  
Level 3 | Discounted cash flow | Maximum | Discount rate    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input   0.565
Level 3 | Discounted cash flow | Maximum | Discount rate | Loans receivable at fair value    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.565  
Level 3 | Discounted cash flow | Weighted Average | Discount rate    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input   0.210
Level 3 | Discounted cash flow | Weighted Average | Discount rate | Loans receivable at fair value    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities, measurement input 0.167