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Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accrued Expenses And Other Current Liabilities [Abstract]    
Salary and related expenses $ 10,474 $ 7,260
Current portion of milestone rights liability 1,643 1,643
Professional fees 872 1,007
Discounts and allowances for commercial product sales 766 873
Sales and marketing services 625 147
Restructuring 362 362
Accrued interest 226 567
Other 962 590
Accrued expenses and other current liabilities $ 15,930 $ 12,449