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Fair Value Measurements - Summary of Company's Assets and Liabilities Measured Fair Value on Recurring Basis (Details) - Fair Value on Recurring Basis - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | $ 4,002 | $ 44,894
Total liabilities, measured at fair value | 20,716 | 163,340
Unissued common stock liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value | 155 |
Earnout share liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value | 20,561 |
Legacy Warrants [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value |  | 14,711
2023 convertible notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value |  | 132,687
Pay-to-Play convertible notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value |  | 15,942
U.S. Government treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value |  | 30,580
U.S. Government money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | 41 | 9,247
Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | 3,836 | 5,067
Committed Equity Facility [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | 125 |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | 3,877 | 44,894
Total liabilities, measured at fair value | 155 |
Level 1 | Unissued common stock liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value | 155 |
Level 1 | U.S. Government treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value |  | 30,580
Level 1 | U.S. Government money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | 41 | 9,247
Level 1 | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | 3,836 | 5,067
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | 125 |
Total liabilities, measured at fair value | 20,561 | 163,340
Level 3 | Earnout share liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value | 20,561 |
Level 3 | Legacy Warrants [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value |  | 14,711
Level 3 | 2023 convertible notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value |  | 132,687
Level 3 | Pay-to-Play convertible notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities, measured at fair value |  | $ 15,942
Level 3 | Committed Equity Facility [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets, measured at fair value | $ 125 |

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