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Property, Plant and Equipment, net - Schedule of property, plant, and equipment (Details) - USD ($)
$ in Thousands
Sep. 26, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 76,401 $ 62,702 $ 48,925
Less: accumulated depreciation 26,008 18,973 15,390
Property, Plant and Equipment, Net, Total 50,393 43,729 33,535
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 1,330 1,330 1,330
Buildings and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 10,123 8,594 7,222
Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 47,042 44,690 37,083
Construction in process [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 17,906 $ 8,088 $ 3,290