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Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Accrued Liabilities And Other Liabilities [Abstract]    
Accrued compensation and related expenses $ 50 $ 40
Accrued clinical   437
Accrued professional services 520 130
Accrued vacation 55 199
Accrued other 166 7
Accrued placement agent fees 3,587  
Total accrued expenses and other liabilities $ 4,378 $ 813