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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