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Equity-Based Compensation - Valuation Assumptions (Details) - Class B Units
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity-Based Compensation    
Expected dividend yield 0.00% 0.00%
Risk-free interest rate 0.30% 1.60%
Expected stock price volatility 59.00% 55.00%
Expected exercise term (in years) 2 years 3 months 18 days 2 years