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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - shares | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | May 31, 2024 | Jun. 30, 2021 | Jan. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Increase in aggregate number of shares of common stock authorized for issuance |  |  | 11,400,000 |  |
Options vesting period | 3 years |  |  |  |
Employee Stock Option |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options vesting period | 7 years |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted stock units awards outstanding (in shares) | 5,593,000 | 5,363,000 |  |  |
Performance Based Restricted Stock Units |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted stock units awards outstanding (in shares) | 1,439,000 | 1,115,000 |  |  |
Maximum | Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Expiration period | 10 years |  |  |  |
Minimum | Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Expiration period | 7 years |  |  |  |
2018 Equity Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Newly reserved shares of common stock | 8,583,472 |  |  | 3,250,000 | 1,500,000
2018 Equity Incentive Plan | Maximum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issued to employees |  |  | 41,440,250 |  |
Performance Based Vesting Schedule | Performance Based Restricted Stock Units |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted stock units awards outstanding (in shares) | 36,000 |  |  |  |

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