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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 30, 2016
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 18,747 $ 19,807
Furniture and fixtures 9,605 8,025
Leasehold improvements 9,564 9,179
Property, Plant and Equipment, Gross 37,916 37,011
Less: accumulated depreciation 25,802 25,221
Property, plant and equipment, net $ 12,114 $ 11,790