Inventory - Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 10,697	$ 7,376
Work-in-process	134	44
Finished goods	6,043	4,688
Reserve for excess and obsolete inventory	(746)	(999)
Total inventory	$ 16,128	$ 11,109