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Equity-based Compensation - Fair value of options (Details) - $ / shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair value of common stock (in dollars per share) $ 3.05 $ 1.75
Expected volatility 91.29%  
Expected volatility, maximum   101.83%
Risk-free interest rate 2.36%  
Risk-free interest rate, minimum   0.67%
Risk-free interest rate, maximum   0.84%
Dividend yield 0.00% 0.00%
Expected term (years) 6 years 29 days  
Minimum    
Expected term (years)   6 years 25 days
Maximum    
Expected term (years)   6 years 2 months 19 days