Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and Equipment, Total	$ 9,652	$ 6,253
Less accumulated depreciation	(4,874)	(5,046)
Property and equipment, net	4,778	1,207
Computer Equipment And Purchased Software
Property, Plant and Equipment [Line Items]
Property and Equipment, Total	3,537	3,418
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, Total	916	688
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and Equipment, Total	1,361	852
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and Equipment, Total	$ 3,838	$ 1,295