Inventory (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 13,355	$ 12,229
Work-in-process	119	111
Finished goods	11,759	7,337
Reserve for excess and obsolete inventory	(1,546)	(1,354)
Total inventory	$ 23,687	$ 18,323