Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Computer equipment and purchased software	$ 3,489	$ 3,564
Machinery and equipment	882	923
Furniture and fixtures	1,290	1,361
Leasehold improvements	3,917	3,838
Total	9,578	9,686
Less accumulated depreciation	(5,562)	(5,097)
Property and equipment, net	$ 4,016	$ 4,589