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v3.25.3

Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Common stock reserved for issuance | 110,653,031 | 110,653,031 | 43,128,526 |
Weighted Average Exercise Price, Granted |  |  | $ 0.92 | $ 0.44
Number of options, accelerated vesting | 388,988 |  |  |
Accelerated incremental stock based compensation expense | $ 1.1 |  |  |
2025 Employee Stock Purchase Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Common stock reserved for issuance | 3,047,669 | 3,047,669 |  |
Purchase price percentage of common stock |  | 85.00% |  |
2025 Incentive Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Common stock reserved for issuance | 20,223,481 | 20,223,481 |  |
Number of authorized shares available for issuance | 30,500,000 | 30,500,000 |  |
Incentive Stock Options |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [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% |  |
Service-based Options |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 4 years |  |
Stock Options [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Uunrecognized compensation cost | $ 15.9 | $ 15.9 |  |
Unrecognized compensation cost, weighted average period |  | 1 year 9 months 18 days |  |
Weighted Average Exercise Price, Granted | $ 2.05 | $ 2.05 |  |
RSUs Redeemable Convertible Preferred Stocks [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost, weighted average period |  | 2 years 8 months 12 days |  |
RSUs unrecognized compensation cost | $ 20.7 | $ 20.7 |  |
Stock based compensation expense |  | $ 3.9 |  |

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