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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Personnel costs $ 2,224 $ 1,998
Clinical trial costs 619 798
Professional fees 643 571
Sales chargebacks, rebates and other revenue reserves 711  
Other 249 422
Accrued expenses $ 4,446 $ 3,789