Inventory - Schedule of Inventory, Classified in Inventory or Other Long-term Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 7,172	$ 6,043
Work in process	4,129	1,788
Finished goods	5,278	7,751
Inventory	16,579	15,582
Other long-term assets	1,156	1,156
Total	$ 17,735	$ 16,738