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Property, Plant and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 02, 2015
Jan. 03, 2014
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 15,674us-gaap_MachineryAndEquipmentGross $ 16,225us-gaap_MachineryAndEquipmentGross
Furniture and fixtures 6,535us-gaap_FurnitureAndFixturesGross 4,837us-gaap_FurnitureAndFixturesGross
Leasehold improvements 8,400us-gaap_LeaseholdImprovementsGross 6,552us-gaap_LeaseholdImprovementsGross
Property, Plant and Equipment, Gross 30,609us-gaap_PropertyPlantAndEquipmentGross 27,614us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 20,543us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 20,209us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, Plant and Equipment, Net $ 10,066us-gaap_PropertyPlantAndEquipmentNet $ 7,405us-gaap_PropertyPlantAndEquipmentNet