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Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Accrued Liabilities And Other Liabilities [Abstract] |  |
Accrued compensation and related expenses | $ 814 | $ 1,411
Accrued severance | 31 | 104
Accrued clinical | 599 | 454
Accrued professional services | 129 | 167
Accrued other | 31 | 83
Total accrued expenses and other liabilities | $ 1,604 | $ 2,219

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