BALANCE SHEET DETAILS - Summary of Components of Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 67,502	$ 70,863
Less: accumulated depreciation	(59,968)	(61,647)
Property and equipment, net	7,534	9,216
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	40,777	42,329
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	9,079	9,908
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 17,646	$ 18,626