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Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Salary and related expenses $ 13,756 $ 11,250
Discounts and allowances for commercial product sales 3,906 3,688
Deferred lease liability 1,426 1,422
Professional fees 1,196 533
Sales and marketing services 278 99
Accrued interest 4,489 519
Other 1,198 859
Milestone rights liability — current 1,337 1,337
Total accrued expenses and other current liabilities $ 27,586 $ 19,707