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Fair Value Measurements - Assets and Liabilities at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Mar. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Public equity securities $ 243,978 $ 291,371
Debt securities available-for-sale 1,777 1,687
Warrants liability 365 227
Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Warrants liability 355 180
Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Warrants liability 10 47
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Warrants liability 0 0
Public equity securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Public equity securities 4,376 4,065
Public equity securities | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Public equity securities 4,376 4,065
Public equity securities | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Public equity securities 0 0
Public equity securities | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Public equity securities 0 0
Debt securities available-for-sale, other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale 1,777 1,687
Debt securities available-for-sale, other | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale 0 0
Debt securities available-for-sale, other | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale 0 0
Debt securities available-for-sale, other | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale $ 1,777 1,687
Other equity interests    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other equity interests   5
Other equity interests | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other equity interests   0
Other equity interests | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other equity interests   5
Other equity interests | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other equity interests   $ 0