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Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Marketable securities |  | $ 97
Investments | $ 41,846 | 40,473
Total assets | 41,846 | 40,570
Liabilities |  |
Earnout liabilities | 3,651 | 996
Total liabilities | 17,240 | 2,928
Public Warrants [Member] |  |
Liabilities |  |
Warrant Liability | 6,884 | 1,016
Private Placement Warrants [Member] |  |
Liabilities |  |
Warrant Liability | 6,705 | 916
Level 1 |  |
Assets |  |
Marketable securities |  | 97
Total assets | 0 | 97
Liabilities |  |
Total liabilities | 6,884 | 1,016
Level 1 | Public Warrants [Member] |  |
Liabilities |  |
Warrant Liability | 6,884 | 1,016
Level 2 |  |
Assets |  |
Investments | 41,846 | 40,473
Total assets | 41,846 | 40,473
Level 3 |  |
Liabilities |  |
Earnout liabilities | 3,651 | 996
Total liabilities | 10,356 | 1,912
Level 3 | Private Placement Warrants [Member] |  |
Liabilities |  |
Warrant Liability | $ 6,705 | $ 916

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