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Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Liabilities And Other Liabilities [Abstract]    
Accrued compensation and related expenses $ 783 $ 31
Accrued severance 337 12
Accrued clinical 912 258
Accrued professional services 52 9
Accrued vacation 148 67
Accrued costs associated with PIPE financing   450
Accrued other 39 146
Total accrued expenses and other liabilities $ 2,271 $ 973