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Fair Value Measurements - Summary of Changes Fair Values of liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Issuance of pre-funded common stock warrants |  |  |  |  | $ 464 | $ 505
Level 3 |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | $ 16,763 | $ 156,795 | $ 163,340 | $ 36,435 | 36,435 |
Issuance of other earnout shares |  |  | 126,024 |  |  |
Committed equity facility - day one put option | 443 |  | 443 |  |  |
Committed equity facility - drawdown forward contracts | (255) |  | (255) |  |  |
Issuance of 2023 convertible notes and related warrants |  |  |  | 110,718 |  |
Issuance of pre-funded common stock warrants |  |  |  | 464 |  |
Change in estimated fair value | 3,735 | 15,488 | 120,522 | 24,666 |  |
Conversion to common stock |  |  | (389,388) |  |  |
Ending Balance | 20,686 | 172,283 | 20,686 | 172,283 | 163,340 | 36,435
Level 3 | Legacy Warrants [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance |  | 7,665 | 14,711 | 3,730 | 3,730 |
Issuance of 2023 convertible notes and related warrants |  |  |  | 4,816 |  |
Issuance of pre-funded common stock warrants |  |  |  | 464 |  |
Change in estimated fair value |  | 90 | 60,345 | (1,255) |  |
Conversion to common stock |  |  | (75,056) |  |  |
Ending Balance |  | 7,755 |  | 7,755 | 14,711 | 3,730
Level 3 | Other Earnout Shares [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 16,763 |  |  |  |  |
Issuance of other earnout shares |  |  | 126,024 |  |  |
Change in estimated fair value | 3,798 |  | (105,463) |  |  |
Ending Balance | 20,561 |  | 20,561 |  |  |
Level 3 | Committed Equity Facility [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Committed equity facility - day one put option | 443 |  | 443 |  |  |
Committed equity facility - drawdown forward contracts | (255) |  | (255) |  |  |
Change in estimated fair value | (63) |  | (63) |  |  |
Ending Balance | $ 125 |  | 125 |  |  |
Level 3 | Pay-to-Play Convertible Notes |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance |  | 16,042 | 15,942 | 14,641 | 14,641 |
Change in estimated fair value |  | (65) | 27,232 | 1,336 |  |
Conversion to common stock |  |  | (43,174) |  |  |
Ending Balance |  | 15,977 |  | 15,977 | 15,942 | 14,641
Level 3 | 2023 Convertible Notes |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance |  | 133,088 | 132,687 | 18,064 | 18,064 |
Issuance of 2023 convertible notes and related warrants |  |  |  | 105,902 |  |
Change in estimated fair value |  | 15,463 | 138,471 | 24,585 |  |
Conversion to common stock |  |  | $ (271,158) |  |  |
Ending Balance |  | $ 148,551 |  | $ 148,551 | $ 132,687 | $ 18,064

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