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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Prepaid external research, development and manufacturing costs | $ 12,333 | $ 15,264
Prepaid insurance | 140 | 1,173
Other | 1,766 | 3,726
Interest receivable | 282 | 263
Finished goods inventory, current | 429 | 0
Prepaid expenses and other current assets | $ 14,950 | $ 20,426

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