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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Prepaid Expense and Other Assets, Current [Abstract]    
Deposits $ 10 $ 67
Undelivered laboratory and office equipment   17
Insurance 95 42
Other current assets 68 195
Prepaid expenses and other current assets $ 173 $ 321