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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, 2019
Dec. 31, 2018
Accrued Liabilities And Other Liabilities [Abstract]    
Accrued compensation and related expenses $ 40 $ 742
Accrued clinical 437 735
Accrued professional services 130 194
Accrued vacation 199 160
Accrued other 7 14
Total accrued expenses and other liabilities $ 813 $ 1,845