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Accrued Expenses - Schedule of Accrued Expenses and Other Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accrued Liabilities and Other Liabilities [Abstract]    
Accrued clinical $ 518  
Accrued compensation and related expenses 349 $ 51
Accrued professional services 276  
Accrued vacation 122 50
Accrued other 221 12
Total accrued expenses $ 1,486 $ 113