Inventory - Schedule of Inventory, Classified in Inventory or Other Long-term Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 7,062	$ 7,506
Work in process	2,712	2,407
Finished goods	4,659	5,709
Inventory	14,433	15,622
Other long-term assets	1,156	1,156
Total	$ 15,589	$ 16,778