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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, 2020
Dec. 31, 2019
Accrued Liabilities And Other Liabilities [Abstract]    
Accrued compensation and related expenses $ 31 $ 40
Accrued clinical 258 437
Accrued professional services 9 130
Accrued vacation 67 199
Accrued costs associated with PIPE financing 450  
Accrued other 146 7
Total accrued expenses and other liabilities $ 961 $ 813