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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid Insurance $ 371 $ 204
Prepaid Clinical Trials   421
Prepaid Other 146 44
Deferred Operating Costs 101 27
Accounts Receivable 1  
Total prepaid expenses and other current assets $ 619 $ 696