Stock-Based Compensation - Schedule of Stock Based Compensation Expense (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Stock-based compensation expense | $ 17,107 | $ 9,716 | $ 34,015 | $ 19,724 |
| Research and Development Expenses [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Stock-based compensation expense | 8,604 | 4,966 | 17,516 | 10,220 |
| General and Administrative Expenses [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Stock-based compensation expense | $ 8,503 | $ 4,750 | $ 16,499 | $ 9,504 |