Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Expenses And Other Current Liabilities [Abstract]
Salary and related expenses	$ 6,715	$ 8,835
Discounts and allowances for commercial product sales	3,458	3,162
Deferred lease liability	1,419	1,433
Milestone Rights liability — current	1,337
Professional fees	391	620
Sales and marketing services	382	147
Accrued interest	410	409
Other	594	1,298
Total accrued expenses and other current liabilities	$ 14,706	$ 15,904