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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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