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Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |
Prepaid insurance | $ 979 | $ 856
Prepaid research and development | 2,721 | 4,771
Other prepaid expenses | 710 | 528
Other current assets | 311 | 247
Total prepaid expenses and other current assets | $ 4,721 | $ 6,402

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