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Fair Value Measurements - Gain (Loss) on Financial Instruments (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  |  | $ (18,024) | $ (23,043) | $ (64,260) | $ (56,101)
Reclassification of realized gain upon transfer from available-for-sale debt security to equity interest | [1] |  |  |  | 13,694 |
Related party equity securities |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  |  | 0 | (20,480) | (3,702) | (63,044)
Other public equity securities |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  |  | (189) | 3 | (925) | (6)
Put options |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  | $ (700) | 0 | (3,825) | (3,023) | (1,081)
Warrant liability |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  |  | 795 | 0 | 2,494 | 0
Prepaid forward liability |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  |  | 61 | 0 | (12) | 0
Derivative liability |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  |  | 0 | 1,275 | 1,581 | 5,078
Other equity interests |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  |  | (18,691) | 0 | (60,515) | 0
Other, without a readily determinable fair value | Without Readily Determinable Fair Value |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Gain (loss) on investment |  |  | $ 0 | $ (16) | $ (158) | $ 2,952
[1] | Retroactively adjusted March 31, 2023 for de-SPAC merger transaction as described in Note 4.

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