Inventory (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 11,761	$ 12,229
Work-in-process	59	111
Finished goods	9,155	7,337
Reserve for excess and obsolete inventory	(2,083)	(1,354)
Total inventory	$ 18,892	$ 18,323