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Revenue (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2021 | Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |  |
Summary of Revenue by Product Category | The following table summarizes total revenue by product category:
|  | For the thirteen weeks ended |  |  | For the thirty-nine weeks ended |
|  | September 26, |  |  | September 27, |  |  | September 26, |  |  | September 27, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Electronic systems |  | $ | 77,199 |  |  | $ | 70,371 |  |  | $ | 241,474 |  |  | $ | 197,493 |
Mechanical systems |  |  | 37,026 |  |  |  | 29,383 |  |  |  | 118,295 |  |  |  | 85,218 |
Exhaust |  |  | 16,971 |  |  |  | 18,905 |  |  |  | 59,587 |  |  |  | 53,062 |
Accessories |  |  | 14,384 |  |  |  | 14,648 |  |  |  | 45,403 |  |  |  | 29,987 |
Safety |  |  | 14,093 |  |  |  | — |  |  |  | 48,287 |  |  |  | — |
Total sales |  | $ | 159,673 |  |  | $ | 133,307 |  |  | $ | 513,046 |  |  | $ | 365,760 |
| The following table summarizes total revenue by product category:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Electronic systems |  | $ | 266,742 |  |  | $ | 199,295 |  |  | $ | 47,110 |
Mechanical systems |  | $ | 119,784 |  |  |  | 92,498 |  |  |  | 41,024 |
Exhaust |  |  | 71,915 |  |  |  | 51,802 |  |  |  | 43,644 |
Accessories |  |  | 38,543 |  |  |  | 25,068 |  |  |  | 6,133 |
Safety |  |  | 7,195 |  |  |  | — |  |  |  | — |
Total sales |  | $ | 504,179 |  |  | $ | 368,663 |  |  | $ | 137,911 |
Summary of Revenue Based on Geographic Location | The following table summarizes total revenue based on geographic location from which the product is shipped:
|  | For the thirteen weeks ended |  |  | For the thirty-nine weeks ended |
|  | September 26, |  |  | September 27, |  |  | September 26, |  |  | September 27, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
United States |  | $ | 155,626 |  |  | $ | 133,307 |  |  | $ | 501,196 |  |  | $ | 365,760 |
Italy |  |  | 4,047 |  |  |  | — |  |  |  | 11,850 |  |  |  | — |
Total sales |  | $ | 159,673 |  |  | $ | 133,307 |  |  | $ | 513,046 |  |  | $ | 365,760 |
| The following table summarizes total revenue based on the geographic location from which the product is shipped for the years ended December 31:
|  | 2020 |  |  | 2019 |  |  | 2018 |
United States |  | $ | 502,661 |  |  | $ | 368,663 |  |  | $ | 137,911 |
Italy |  |  | 1,518 |  |  |  | — |  |  |  | — |
Total sales |  | $ | 504,179 |  |  | $ | 368,663 |  |  | $ | 137,911 |

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 + Details
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