Stock-Based Compensation - Stock-based Compensation Expense included in Accompanying Statements of Operations and Comprehensive Loss (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
| Total stock-based compensation | $ 10,727 | $ 2,972 |
| Research and Development [Member] | ||
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
| Total stock-based compensation | 3,540 | 905 |
| General and Administrative [Member] | ||
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
| Total stock-based compensation | $ 7,187 | $ 2,067 |