PROPERTY AND EQUIPMENT - SCHEDULE OF PROPERTY AND EQUIPMENT (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, total	$ 9,286	$ 9,578
Less accumulated depreciation	(5,881)	(5,562)
Property and equipment, net	3,405	4,016
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, total	3,199	3,489
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, total	838	882
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, total	1,287	1,290
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, total	$ 3,962	$ 3,917