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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Accrued Liabilities [Abstract] |  |
Accrued external research, development and manufacturing costs | $ 17,366 | $ 41,680
Accrued professional and consultant fees | 1,972 | 2,199
Accrued employee compensation | 3,407 | 3,916
Accrued inventory | 414 | 518
Other | 2,118 | 1,884
Accrued expenses | $ 25,277 | $ 50,197

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