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Prepaid Expenses Other Assets Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Accrued Liabilities And Other Liabilities [Abstract] |  |
Accrued compensation and related expenses | $ 1,411 | $ 98
Accrued severance | 104 | 12
Accrued clinical | 454 | 258
Accrued professional services | 167 | 9
Accrued costs associated with PIPE financing |  | 450
Accrued other | 83 | 146
Total accrued expenses and other liabilities | $ 2,219 | $ 973

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