BALANCE SHEET DETAILS - Summary of Components of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 66,390	$ 67,502
Less: accumulated depreciation	(58,154)	(59,968)
Property and equipment, net	8,236	7,534
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	41,463	40,777
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	8,531	9,079
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 16,396	$ 17,646