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Stockholders' Equity and Members Units Including Redeemable Convertible Class P Units - Quantitative Information and Valuation Methods (Details) - Fair Value, Inputs, Level 3 | 9 Months Ended | 12 Months Ended
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Sep. 22, 2021 | Sep. 21, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class of Warrant or Right [Line Items] |  |  |  |
Control premium | 20.00% |  | 20.00% | 20.00%
Valuation Technique, Discounted Cash Flow |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Discount rate | 22.00% |  |  | 25.00%
Valuation Technique, Discounted Cash Flow | Minimum |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Discount rate |  |  | 22.00% |
Valuation Technique, Discounted Cash Flow | Maximum |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Discount rate |  |  | 25.00% |
Class P Warrants and Class M Units |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Volatility |  | 40.00% | 45.00% | 35.00%
Time to Liquidity in years |  |  |  | 2 years 4 months 24 days
Risk free rate | 0.07% |  | 0.10% | 1.60%
Discount for lack of marketability |  |  |  | 18.00%
Class P Warrants and Class M Units | Minimum |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Time to Liquidity in years | 9 months 18 days |  | 1 year 2 months 12 days |
Discount for lack of marketability | 7.50% |  | 12.00% |
Class P Warrants and Class M Units | Maximum |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Time to Liquidity in years | 1 year |  | 1 year 6 months |
Discount for lack of marketability | 10.00% |  | 15.00% |

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