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Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued Expenses And Other Current Liabilities [Abstract]    
Salary and related expenses $ 9,099 $ 8,110
Current portion of milestone rights liability 1,643 1,643
Professional fees 875 741
Discounts and allowances for commercial product sales 2,865 2,656
Sales and marketing services 560 88
Accrued interest 494 492
Deferred Lease Liability 1,545 257
Other 983 1,035
Total accrued expenses and other current liabilities $ 18,064 $ 15,022