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Balance Sheet Components (Property and Equipment) (Details) - USD ($)
$ in Thousands
Jun. 28, 2015
Dec. 28, 2014
Property and equipment:    
Property and equipment, gross $ 18,377 $ 18,684
Accumulated depreciation and amortization (15,688) (15,467)
Property and equipment, net 2,689 3,217
Equipment    
Property and equipment:    
Property and equipment, gross 14,100 14,047
Software    
Property and equipment:    
Property and equipment, gross 2,852 3,332
Furniture and fixtures    
Property and equipment:    
Property and equipment, gross 711 710
Leasehold improvements    
Property and equipment:    
Property and equipment, gross $ 714 $ 595