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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Accrued vacation $ 81 $ 31
Accrued wages and termination 312 60
Accrued interest payable   3,338
Accrued clinical & consulting 117 16
Accrued legal & patent 315 44
Accrued other expenses 188 55
Total accrued expenses $ 1,013 $ 3,544