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Balance Sheet Components - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Prepaid research and development costs | $ 2,300 | $ 2,617
Prepaid insurance | 1,013 | 704
Prepaid and other current assets | 863 | 823
Total prepaid expenses and other current assets | $ 4,176 | $ 4,144

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