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Equity-Based Compensation Plans (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2021 | Dec. 31, 2020
Summary of Share-based Compensation Arrangements by Share-based Payment Award |  | The tables below summarize the PIU activity during the years ended December 31, 2020 and 2019:
|  | Outstanding PIUs |  |  | Weighted Average Grant Date Fair Value |
December 31, 2017 |  |  | — |  |  | $ | — |
Granted |  |  | 27,925 |  |  |  | 0.27 |
December 31, 2018 |  |  | 27,925 |  |  |  | 0.27 |
Granted |  |  | 3,906 |  |  |  | 0.25 |
December 31, 2019 |  |  | 31,831 |  |  |  | 0.27 |
Granted |  |  | 5,932 |  |  |  | 0.28 |
Forfeited |  |  | (2,193 | ) |  |  | 0.27 |
December 31, 2020 |  |  | 35,570 |  |  | $ | 0.27 |
Schedule of Components of Equity-based compensation expense | Equity-based compensation expense included the following components:
|  | For the thirteen weeks ended |  |  | For the thirty-nine weeks ended |
|  | September 26, 2021 |  |  | September 27, 2020 |  |  | September 26, 2021 |  |  | September 27, 2020 |
Stock options |  | $ | 376 |  |  | $ | — |  |  | $ | 376 |  |  | $ | — |
Profit interest units |  |  | 2,110 |  |  |  | 121 |  |  |  | 2,372 |  |  |  | 356 |
| The following table presents the effects of equity-based compensation on the consolidated statements of comprehensive income (loss) during the periods presented:
|  | Year ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Selling, general and administrative |  | $ | 487 |  |  | $ | 437 |  |  | $ | — |
Schedule Of Share-Based Payment Award Stock Options Valuation using Black-Scholes option pricing model | The fair value of each stock option granted on July 16, 2021 was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:
Weighted-average expected term |  |  | 6.0 |
Expected volatility |  |  | 40.3 | %
Expected dividend |  | $ | — |
Risk-free interest rate |  |  | 0.94 | %
Profit Interest Units [Member] |  |
Schedule Of Share-Based Payment Award Stock Options Valuation using Black-Scholes option pricing model |  | The fair value of PIUs is estimated on the grant date with the following assumptions:
|  | Year ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Weighted-average expected term |  |  | 3.4 |  |  |  | 4.1 |  |  |  | 4.8 |
Expected volatility |  |  | 72.5 | % |  |  | 72.5 | % |  |  | 62.5 | %
Expected dividend |  |  | — |  |  |  | — |  |  |  | — |
Risk-free interest rate |  |  | 0.3 | % |  |  | 1.5 | % |  |  | 2.5 | %

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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