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Prepaid and Other Current Assets - Summary of Prepaid and Other Current Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Down payments for inventory | $ 970 | $ 1,080
Prepaid research and development | 20,156 | 7,780
Other prepaid expenses | 10,434 | 9,508
Total prepaid assets | 31,560 | 18,368
Royalties receivable | 6,534 | 4,525
Receivable from collaboration agreement | 2,563 | 2,272
Deposits and other current assets | 1,061 | 4,847
Total other current assets | $ 10,158 | $ 11,644

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