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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid Insurance $ 111 $ 197
Prepaid Clinical Trials 62 9
Prepaid Other 126 58
Stock Subscriptions 108 206
Deferred Clinical Costs 6 107
Total prepaid and other current assets $ 413 $ 577