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Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Number of Options, Beginning balance | 36,363,184 | 16,437,980 | 1,325,844 |
Number of options outstanding, Granted |  | 21,329,457 | 15,141,280 |
Number of options outstanding, Exercised |  | $ (17,000) | $ 0 |
Number of Options, Forfeited |  | (1,333,107) | (19,543) |
Number of Options, Ending balance |  | 36,363,184 | 16,437,980 | 1,325,844
Number of Options, Vested and expected to vest |  | 35,560,434 |  |
Number of Options, Exercisable |  | 9,614,865 |  |
Weighted Average Exercise Price, Beginning Balance | $ 0.99 | $ 1.12 | $ 9.1 |
Weighted Average Exercise Price, Granted |  | 0.92 | 0.44 |
Weighted Average Exercise Price, Exercised |  | 1.49 | 0.8 |
Weighted average exercise price, Forfeited |  | 1.54 | 15.53 |
Weighted Average Exercise Price, Ending Balance |  | 0.99 | $ 1.12 | $ 9.1
Weighted average exercise price, Vested and expected to vest |  | 0.99 |  |
Weighted average exercise price, Exercisable |  | $ 1.58 |  |
Weighted average remaining contractual life (in years) |  | 9 years 2 months 12 days | 9 years 3 months 18 days | 5 years 7 months 6 days
Weighted average remaining contractual life (in years), Vested and expected to vest |  | 9 years 1 month 6 days |  |
Weighted average remaining contractual life (in years), Exercisable |  | 8 years 3 months 18 days |  |
Aggregate intrinsic value, Outstanding |  | $ 22,845 | $ 13,907,000 | $ 925,000
Aggregate intrinsic value, Vested and expected to vest |  | 22,492 |  |
Aggregate intrinsic value, Exercisable |  | $ 7,066 |  |
2011 Amended Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Number of Options, Beginning balance | 28,360,635 |  |  |
Number of options outstanding, Granted | 1,347,536 |  | 10,929,820 |
Number of options outstanding, Exercised | $ (15,080,000) |  |  |
Number of Options, Forfeited | (374,308) |  |  |
Number of Options, Ending balance | 29,318,783 | 28,360,635 |  |
Number of Options, Vested and expected to vest | 29,318,783 |  |  |
Number of Options, Exercisable | 15,847,903 |  |  |
Weighted Average Exercise Price, Beginning Balance | $ 1.27 |  |  |
Weighted Average Exercise Price, Granted | 3.57 |  |  |
Weighted Average Exercise Price, Exercised | 1.18 |  |  |
Weighted average exercise price, Forfeited | 1.31 |  |  |
Weighted Average Exercise Price, Ending Balance | 1.37 | $ 1.27 |  |
Weighted average exercise price, Vested and expected to vest | 1.37 |  |  |
Weighted average exercise price, Exercisable | $ 1.48 |  |  |
Weighted average remaining contractual life (in years) | 8 years 6 months | 9 years 2 months 12 days |  |
Weighted average remaining contractual life (in years), Vested and expected to vest | 8 years 6 months |  |  |
Weighted average remaining contractual life (in years), Exercisable | 8 years 1 month 6 days |  |  |
Aggregate intrinsic value, Outstanding | $ 68,324,000 | $ 22,741,000 |  |
Aggregate intrinsic value, Vested and expected to vest | 68,324,000 |  |  |
Aggregate intrinsic value, Exercisable | $ 38,507,000 |  |  |

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- Definition Line items represent financial concepts included in a table. 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