Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accrued Expenses And Other Current Liabilities [Abstract]
Salary and related expenses	$ 7,745	$ 8,835
Discounts and allowances for commercial product sales	3,491	3,162
Deferred lease liability	1,421	1,433
Milestone Rights liability — current	1,337
Professional fees	329	620
Sales and marketing services	345	147
Accrued interest	350	409
Other	796	1,298
Total accrued expenses and other current liabilities	$ 15,814	$ 15,904