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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Accrued clinical trial costs $ 2,579 $ 2,631
Accrued contract manufacturing expenses 1,404 945
Accrued compensation and benefits 749 1,864
Accrued interest 116 136
Other accrued expenses 711 883
Total accrued expenses $ 5,559 $ 6,459