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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid Insurance $ 301 $ 243
Prepaid Clinical Trials 394 419
Prepaid Other 158 27
Deferred Operating Costs 107 28
Total prepaid expenses and other current assets $ 960 $ 717