Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Personnel costs	$ 2,330	$ 5,686
Clinical trial costs	50	0
Professional fees	685	647
Sales chargebacks, rebates and other revenue reserves	1,475	1,109
Other	1,375	1,003
Accrued expenses	$ 5,915	$ 8,445