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Revenue - Summary of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total sales	$ 159,673	$ 133,307	$ 513,046	$ 365,760	$ 504,179	$ 368,663	$ 137,911
United States [Member]
Disaggregation of Revenue [Line Items]
Total sales	155,626	133,307	501,196	365,760	502,661	368,663	137,911
Italy [Member]
Disaggregation of Revenue [Line Items]
Total sales	$ 4,047		$ 11,850		$ 1,518

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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