Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accrued Expenses And Other Current Liabilities [Abstract]
Salary and related expenses	$ 7,563	$ 8,110
Discounts and allowances for commercial product sales	3,009	2,656
Deferred lease liability	1,407	257
Current portion of Milestone Rights liability		1,643
Accrued repairs and maintenance	798
Professional fees	607	741
Sales and marketing services	223	88
Accrued interest	319	492
Other	372	1,035
Total accrued expenses and other current liabilities	$ 14,298	$ 15,022