v3.22.1
Compensation Plans - Valuation Assumptions (Details) - Stock options - Class A common stock
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Expected volatility, minimum 100.00% 96.00%
Expected volatility, maximum 107.00% 103.00%
Expected dividend yield 0.00% 0.00%
Risk-free interest rate, minimum 0.78% 0.23%
Risk-free interest rate, maximum 1.37% 1.72%
Minimum    
Expected term 5 years 3 months 5 years 1 month 24 days
Maximum    
Expected term 6 years 3 months 6 years 3 months