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Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accrued Expenses and Other Current Liabilities [Line Items]    
Salary and related expenses $ 7,533 $ 5,662
Sales and marketing services 4,036  
Professional fees 1,300 931
Discounts and allowances for commercial product sales 623  
Other services 260 309
Accrued interest 212 615
Other 200 174
Construction in progress   238
Accrued expenses and other current liabilities $ 14,164 $ 7,929