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Fair Value Measurements - Assets and Liabilities at Fair Value on a Recurring Basis (Details) - USD ($) | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments | $ 378,420,000 | $ 497,221,000 |
Debt securities available-for-sale | 3,127,000 | 76,898,000 |
Warrant liability | 161,000 | 0 | [1]
Prepaid forward liability | 12,000 |  |
Derivative liability |  | 3,513,000 |
Level 1 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Warrant liability | 161,000 |  |
Prepaid forward liability | 12,000 |  |
Derivative liability |  | 0 |
Level 2 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Warrant liability | 0 |  |
Prepaid forward liability | 0 |  |
Derivative liability |  | 0 |
Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Warrant liability | 0 |  |
Prepaid forward liability | 0 |  |
Derivative liability |  | 3,513,000 |
Public equity securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments | 4,210,000 | 8,837,000 |
Public equity securities | Level 1 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments | 4,210,000 | 8,837,000 |
Public equity securities | Level 2 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments | 0 | 0 |
Public equity securities | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments | 0 | 0 |
Other equity interests |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other equity interests | 3,797,000 |  |
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 | 3,797,000 |  |
Other equity interests | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other equity interests | 0 |  |
Put options |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments | 0 | 3,991,000 |
Put options | Level 1 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments |  | 3,991,000 |
Put options | Level 2 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments |  | 0 |
Put options | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Investments |  | 0 |
Corporate debt securities (L Bonds) |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities available-for-sale |  | 73,822,000 |
Corporate debt securities (L Bonds) | Level 1 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities available-for-sale |  | 0 |
Corporate debt securities (L Bonds) | Level 2 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities available-for-sale |  | 73,822,000 |
Corporate debt securities (L Bonds) | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities available-for-sale |  | 0 |
Other debt securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities available-for-sale | 3,127,000 | 3,076,000 |
Other debt securities | Level 1 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities available-for-sale | 0 | 0 |
Other debt securities | Level 2 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities available-for-sale | 998,000 | 998,000 |
Other debt securities | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities available-for-sale | $ 2,129,000 | $ 2,078,000 |
[1] | Retroactively adjusted March 31, 2023 for the de-SPAC merger transaction as described in Note 4. Such adjustments are unaudited.

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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