Inventory - Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 7,376	$ 9,690
Work-in-process	44	131
Finished goods	4,688	3,492
Reserve for excess and obsolete inventory	(999)	(2,320)
Total inventory	$ 11,109	$ 10,993