BALANCE SHEET DETAILS - Components of Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 68,998	$ 70,863
Less: accumulated depreciation	(60,725)	(61,647)
Property and equipment, net	8,273	9,216
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	41,559	42,329
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	9,362	9,908
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 18,077	$ 18,626