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Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Expenses And Other Current Liabilities [Abstract]    
Salary and related expenses $ 7,223 $ 8,110
Current portion of milestone rights liability 1,643 1,643
Professional fees 711 741
Discounts and allowances for commercial product sales 2,819 2,656
Sales and marketing services 321 88
Accrued interest 733 492
Deferred lease liability 1,432 257
Other 1,570 1,035
Total accrued expenses and other current liabilities $ 16,452 $ 15,022