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Equity-Based Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 23, 2021 | Jul. 16, 2021 | Sep. 26, 2021 | Sep. 26, 2021 | Sep. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
2021 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  | 8,850,000 | 8,850,000 |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 6,797,101 | 6,797,101 |  |  |  |  |
Restricted stock units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grants in period | 658,891 |  |  |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |  |  |
Weighted average grant date fair value |  |  | $ 12.06 |  |  |  |  |  |
Unrecognized compensation cost |  |  | $ 7,946 | $ 7,946 |  |  |  |  |
Remaining weighted average period |  |  | 2 years 6 months |  |  |  |  |  |
Restricted stock units [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting Period |  |  | 3 years |  |  |  |  |  |
Restricted stock units [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting Period |  |  | 1 year |  |  |  |  |  |
Profit Interest Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grants in period |  |  |  | 8,445 | 5,932 |  |  |  |
Shares vested |  |  |  | 2,169 | 1,228 |  |  |  |
Shares Unvested |  |  | 36,045 | 36,045 | 4,507 |  |  |  |
Weighted average grant date fair value, options non-vested |  |  | $ 0.64 | $ 0.64 | $ 0.27 |  |  |  |
Unrecognized compensation cost |  |  | $ 15,999 | $ 15,999 |  |  |  |  |
Total grant date fair value |  |  |  | $ 2,110 | $ 356 |  |  |  |
Remaining weighted average period |  |  |  | 1 year 10 months 24 days |  |  |  |  |
Forfeited |  |  |  | 2,614 |  |  |  |  |
Profit Interest Units [Member] | Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  | 41,400,000 |  |  |
Grants in period |  |  |  |  |  | 5,932 | 3,906 | 27,925 |
Shares Unvested |  |  |  |  |  | 35,570 | 31,831 | 27,925 |
Weighted average grant date fair value, options non-vested |  |  |  |  |  | $ 0.27 | $ 0.27 | $ 0.27 |
Unrecognized compensation cost |  |  |  |  |  | $ 1,737 |  |  |
Remaining weighted average period |  |  |  |  |  | 3 years 4 months 24 days |  |  |
Share based compensation by share based award unvested options aggegate fair value |  |  |  |  |  | $ 32,383 | $ 30,323 | $ 27,925 |
Share based compensation by share based award options vested in period aggregate fair value |  |  |  |  |  | $ 487 | $ 437 |  |
Share based compensation by share based award option vested in period units |  |  |  |  |  | 3,187 | 1,508 |  |
Profit Interest Units [Member] | Incentive Plan [Member] | Unvested Profit Interest Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average grant date fair value, options non-vested |  |  |  |  |  | $ 0.26 | $ 0.28 | $ 0.27 |
Profit Interest Units [Member] | Incentive Plan [Member] | Performance Based Vesting [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grants in period |  |  |  |  |  | 4,507 | 2,967 | 20,700 |
Weighted average grant date fair value |  |  |  |  |  | $ 0.27 | $ 0.24 | $ 0.26 |
Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grants in period |  | 1,394,008 |  |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |  |  |
Weighted average grant date fair value, options non-vested |  |  | $ 3.88 | $ 3.88 |  |  |  |  |
Unrecognized compensation cost |  |  | $ 5,033 | $ 5,033 |  |  |  |  |
Remaining weighted average period |  |  | 2 years 9 months 18 days |  |  |  |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting Period |  |  |  | 3 years |  |  |  |  |

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