Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accrued Expenses And Other Current Liabilities [Abstract]
Salary and related expenses	$ 10,217	$ 8,835
Discounts and allowances for commercial product sales	3,534	3,162
Deferred lease liability	1,415	1,433
Milestone Rights liability — current	1,337
Professional fees	314	620
Sales and marketing services	309	147
Accrued interest	337	409
Other	863	1,298
Total accrued expenses and other current liabilities	$ 18,326	$ 15,904