Prepaid Expenses and Other Current Assets and Accrued Expenses - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Prepaid Expense and Other Assets, Current [Abstract] | ||
| Prepaid Contract Research Organization Costs and Clinical Trial Expenses | $ 38,694 | $ 11,507 |
| Other prepaid expenses and other current assets | 4,668 | 1,712 |
| Total prepaid expenses and other current assets | $ 43,362 | $ 13,219 |