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Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Expenses And Other Current Liabilities [Abstract]    
Salary and related expenses $ 8,835 $ 8,110
Discounts and allowances for commercial product sales 3,162 2,656
Deferred lease liability 1,433 257
Professional fees 620 457
Accrued interest 409 492
Sales and marketing services 147 88
Other 1,298 1,319
Current portion of milestone rights liability   1,643
Accrued expenses and other current liabilities $ 15,904 $ 15,022