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Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accrued Expenses and Other Current Liabilities [Line Items]    
Salary and related expenses $ 3,729 $ 3,814
Current portion of milestone rights liability 1,643  
Professional fees 968 875
Discounts and allowances for commercial product sales 1,036 754
Sales and marketing services 218 144
Restructuring 362 1,376
Accrued interest 624 619
Other 496 355
Accrued expenses and other current liabilities $ 9,076 $ 7,937