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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Accrued clinical trial costs $ 3,083 $ 2,648
Accrued contract manufacturing expenses 9 226
Accrued compensation and benefits 146 1,080
Accrued interest   82
Other accrued expenses 300 575
Total accrued expenses $ 3,538 $ 4,611