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Property, Plant and Equipment - Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 28, 2019
Dec. 28, 2018
Property Plant And Equipment [Abstract]    
Machinery and equipment $ 21,266 $ 19,000
Furniture and fixtures 9,880 9,860
Leasehold improvements 10,095 10,045
Total property, plant and equipment, gross 41,241 38,905
Less accumulated depreciation 27,859 27,454
Total property, plant and equipment, net $ 13,382 $ 11,451