Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Royalties	$ 10,245	$ 17,854
Inventory liabilities	7,084	5,943
Salaries and employee benefits	2,891	4,064
Professional fees	1,671	1,376
Bonuses	1,152	1,914
Goods in transit	1,072	1,669
Interest expense	878	1,398
Unearned revenue	561	3,924
Sales commissions	398	663
Other	3,962	3,340
Accrued expenses	$ 29,914	$ 42,145