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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 29, 2017
Dec. 30, 2016
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 17,680 $ 19,807
Furniture and fixtures 9,410 8,025
Leasehold improvements 9,597 9,179
Property, Plant and Equipment, Gross 36,687 37,011
Less: accumulated depreciation 25,688 25,221
Property, plant and equipment, net $ 10,999 $ 11,790