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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Amounts due under Asset Purchase Agreement | $ 1,837 | $ 4,837
Payroll tax credit | 555 | 555
Prepaid expenses | 757 | 813
Prepaid external research and development | 118 | 528
Deferred transaction costs | 90 | 0
Other | 19 | 20
Total prepaid expenses and other current assets | $ 3,376 | $ 6,753

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