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Equity-Based Compensation - Assumptions (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity-Based Compensation      
Method used Black-Scholes Black-Scholes  
Risk-free interest rate, min   0.62% 0.37%
Risk-free interest rate, max   1.31% 0.59%
Expected option life (in years) 6 years 3 months 6 years 3 months 6 years 3 months
Expected price volatility, min   64.60% 64.60%
Expected price volatility, max   73.98% 69.21%