BALANCE SHEET DETAILS - Components of Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 67,347	$ 70,863
Less: accumulated depreciation	(58,300)	(61,647)
Property and equipment, net	9,047	9,216
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	39,981	42,329
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	9,648	9,908
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 17,718	$ 18,626