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Fair Value Measurements - Recurring and Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Measurements |  |
Warrants, at fair value | $ 1,600 | $ 9,000
Level 1 |  |
Fair Value Measurements |  |
Restricted Cash Held in Trust | 154,200 | 331,800
Level 2 |  |
Fair Value Measurements |  |
Short-Term Investments | $ 28 | $ 7,600

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