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Common stock and Stock-Based Compensation -Additional Information (Details) - USD ($) | 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 | Jan. 14, 2025 | Dec. 31, 2022
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | 600,000,000 |  | 600,000,000 |  | 136,562,809 | 175,095,000 |  |
Common Stock, Shares, Issued | 106,754,588 |  | 106,754,588 |  | 48,376,052 | 17,454,353 |  |
Common Stock, Shares, Outstanding | 106,754,588 |  | 106,754,588 |  | 48,376,052 | 17,454,353 | 98,818,874 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  |  |  |  | 35,560,434 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 110,653,031 |  | 110,653,031 |  | 43,128,526 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  | $ 17,000 | $ 0 |  |
Share Price |  |  |  |  | $ 0.88 | $ 0.25 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value |  |  |  |  | $ 2,800,000 | $ 800,000 |  |
Unrecognized Compensation Expense |  |  |  |  | $ 18,200,000 |  |  |
Share Based Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions WeightedAverage Period |  |  |  |  | 2 years 4 months 24 days |  |  |
Share-Based Payment Arrangement, Noncash Expense | $ 9,486,000 | $ 359,000 | $ 28,092,000 | $ 1,042,000 | $ 3,847,000 | $ 2,483,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 21,329,457 | 15,141,280 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Number | 388,988 |  |  |  |  |  |  |
Stock options available for future issuance [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 2,226,705 | 839,706 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Unrecognized Compensation Expense |  |  |  |  | $ 6,300,000 |  |  |
Share-Based Payment Arrangement, Noncash Expense |  |  |  |  | $ 0 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  | 175,095,000 | 175,095,000 |  |
Common Stock, Shares, Issued |  |  |  |  | 17,519,999 |  |  |
Common Stock, Shares, Outstanding |  |  |  |  | 17,519,999 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 96,123,126 | 75,514,616 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period |  |  |  |  |  | 6,000,000 |  |
Incentive Stock Options [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Minimum Threshold Limit Of Percentage Of Owning Stock With Voting Power On Grant Date |  |  |  |  | 10.00% |  |  |
Minimum Threshold Limit Of Shares Fair Value On Grant Date |  |  |  |  | 110.00% |  |  |
Two Thousand Eleven Amended Plan [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Plan Modification, Description and Terms |  |  |  |  | Amended Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 29,318,783 |  | 29,318,783 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares |  |  |  |  | 4,655,274 | 4,916,829 |  | 137,909
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | $ 15,080,000 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  | 1,347,536 |  |  | 10,929,820 |  |
Two Thousand Eleven Amended Plan [Member] | Stock options available for future issuance [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 2,226,705 |  |  |
Two Thousand Eleven Amended Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares |  |  |  |  | 4,655,274 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period |  |  |  |  | 6,000,000 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited |  |  |  |  | 135,400 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 6,000,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Number |  |  |  |  | 6,000,000 |  |  |
Two Thousand Eleven Amended Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  |  |  |  | 36,363,184 |  |  |
Modification Of vesting Terms [Member] |  |  |  |  |  |  |  |
Common stock and StockBased Compensation [Line Items] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Noncash Expense |  |  |  |  |  | $ 1,700,000 |  |

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