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Stock-based Compensation - Additional information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2026 | Dec. 31, 2025 | Sep. 23, 2025 | Dec. 31, 2024 | Oct. 31, 2023 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock |  |  |  | 173,751 |  | 250,523,000 | 173,751 |
Weighted-average grant-date fair value per share |  |  |  |  |  |  | $ 0.42 | $ 0.27
Grant-date fair value of stock options |  |  |  |  |  |  | $ 3.3 | $ 1.9
Expense related to unvested options |  |  |  |  |  | $ 69.2 | $ 12.3 |
Estimated weighted average period |  |  |  |  |  | 2 years 7 months 6 days | 2 years 4 months 24 days |
Incremental expense |  |  |  |  | $ 0.6 |  |  |
Accelerated compensation cost |  |  |  |  | $ 0.3 |  |  |
Share-based compensation arrangement by share-based payment award, options, forfeitures in period |  |  |  |  |  | 1,902,000 | 4,780,000 |
Share-based compensation arrangement by share-based payment award, options, grants in period, gross |  |  |  |  |  | 11,308,000 | 18,727,000 |
2018 Plan [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock |  |  |  | 2,174,985 |  |  | 2,174,985 |
Estimated fair value of the shares |  |  |  | 100.00% |  |  |  |
General vesting term for stock options |  |  |  | 4 years |  |  |  |
General vesting term for stock options, award requisite service period |  |  |  | 1 year |  |  |  |
2018 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award |  |  |  | five |  |  |  |
2018 Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award |  |  |  | 10 |  |  |  |
2025 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, employee benefit plan |  |  | 28,195,000 |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, forfeitures in period |  |  | 56,100,142 |  |  |  |  |
2025 Equity Incentive Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, employee benefit plan | 56,390,000 |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, percentage of outstanding stock maximum |  | 5.00% |  |  |  |  |  |
2025 Equity Incentive Plan [Member] | Share-Based Payment Arrangement [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, grants in period, gross |  |  | 0 |  |  |  |  |
2025 Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, employee stock purchase plans |  |  | 5,639,000 |  |  |  |  |
Percentage of purchase price for each share offered at lesser value |  |  | 85.00% |  |  |  |  |
Percentage of purchase price for each share offered |  |  | 85.00% |  |  |  |  |
2025 Employee Stock Purchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, percentage of outstanding stock maximum |  | 1.00% |  |  |  |  |  |
2025 Employee Stock Purchase Plan [Member] | Minimum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, employee stock purchase plans | 11,280,000 |  |  |  |  |  |  |

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