Inventory - Schedule of Inventory, Classified in Inventory or Other Long-term Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 6,801	$ 7,506
Work in process	4,273	2,407
Finished goods	4,467	5,709
Inventory	15,541	15,622
Other long-term assets	1,156	1,156
Total	$ 16,697	$ 16,778