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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Accrued vacation $ 95 $ 54
Accrued wages and incentive 517 796
Accrued clinical & consulting 1,505 202
Accrued legal & patent 151 51
Accrued end of term fee 195 155
Deferred Rent 57 46
Accrued other expenses 63 13
Total accrued expenses and other current liabilities $ 2,583 $ 1,317