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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

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