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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Accrued vacation $ 70 $ 31
Accrued wages and incentive 432 60
Accrued interest payable   3,338
Accrued clinical & consulting 411 16
Accrued legal & patent 106 44
Accrued other expenses 116 55
Total accrued expenses $ 1,135 $ 3,544