Accrued Expenses and Other Current Liabilities - Schedule of accrued expenses and other current liabilities (Parenthetical) (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
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|---|---|---|---|---|---|---|
| Accrued Expenses and Other Current Liabilities [Line Items] | ||||||
| Accrued research and development | [1] | $ 21,642 | $ 10,784 | |||
| Accrued professional and consulting | [2] | 1,328 | 827 | |||
| Related Party | ||||||
| Accrued Expenses and Other Current Liabilities [Line Items] | ||||||
| Accrued research and development | 11,008 | 10,333 | ||||
| Accrued professional and consulting | $ 0 | $ 232 | ||||
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