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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Personnel costs $ 1,715 $ 3,263
Clinical trial costs 56 345
Professional fees 429 700
Sales chargebacks, rebates and other revenue reserves 1,508 1,889
Other 851 635
Accrued expenses $ 4,559 $ 6,832