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Property, Plant and Equipment - Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Dec. 28, 2018
Property Plant And Equipment [Abstract]    
Machinery and equipment $ 17,027 $ 16,905
Computer equipment and software 6,074 5,992
Furniture and fixtures 4,157 3,868
Leasehold improvements 10,118 10,045
Construction in process 5,952 2,095
Total property, plant and equipment, gross 43,328 38,905
Less accumulated depreciation 28,482 27,454
Total property, plant and equipment, net $ 14,846 $ 11,451