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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
	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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