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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Personnel costs $ 2,066 $ 1,998
Clinical trial costs 554 798
Professional fees 400 571
Product revenue allowances and reserves 1,051  
Other 143 422
Accrued expenses $ 4,214 $ 3,789