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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Personnel costs $ 4,513 $ 5,686
Clinical trial costs 916 0
Professional fees 486 647
Sales chargebacks, rebates and other revenue reserves 2,678 1,109
Commissions due to commercialization partner for DEXYCU 1,464 254
Other 1,406 749
Accrued expenses $ 11,463 $ 8,445