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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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Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c),9(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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