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Property, Plant and Equipment, net - Schedule of long-lived assets by geographic locations (Details) - USD ($)
$ in Thousands
Sep. 26, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, net $ 50,393 $ 43,729 $ 33,535
United States [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, net 48,359 42,264 32,977
International [member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, net $ 2,034 $ 1,465 $ 558