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Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation (Additional Information) (Details) - USD ($) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock shares outstanding |  | 32,129,970 | 23,410,348 |
Common stock, shares issued |  | 32,129,970 | 23,410,348 | 706,701
Common stock, shares issued on liquidation |  | 24,999,970 |  |
Deferred offering costs |  | $ 0 |  |
Common Stock Allocated to Series A-1 And Series A-2 Preferred Unit Holders [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Stock issued during period, shares, new issues |  | 5,257,590 |  |
Common Stock Allocated To SeriesB Preferred Units Holders [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Stock issued during period, shares, new issues |  | 16,402,235 |  |
Common Stock Allocated to Common Unit Holders [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Stock issued during period, shares, new issues |  | 706,701 |  |
Common Stock Allocated To Performance Based Incentive Common Unit Holders Member |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Stock issued during period, shares, new issues |  | 188,454 |  |
Common Stock Allocated To Incentive Units Holders [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Stock issued during period, shares, new issues |  | 2,444,990 |  |
Additional Paid-In Capital [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Deferred offering costs |  | $ 3,200,000 |  |
IPO [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Shares issued price per share | $ 13.00 |  |  |
Stock issued during period, shares, new issues | 7,130,000 |  |  |
Prior to IPO [Member] | Series A-1 and A-2 Redeemable Convertible Preferred Unit [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock shares outstanding |  | 33,478,255 |  |
Prior to IPO [Member] | Series B Redeemable Convertible Preferred Unit [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock shares outstanding |  | 104,442,965 |  |
Prior to IPO [Member] | Common Units [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock shares outstanding |  | 4,500,000 |  |
Prior to IPO [Member] | Performance Based Incentive Common Units [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock shares outstanding |  | 1,200,000 |  |
Prior to IPO [Member] | Incentive units [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock shares outstanding |  | 20,869,704 |  |

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