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Share Based Compensation - Weighted average assumptions for the options granted (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share Based Compensation        
Exercise price $ 6.94 $ 5.96 $ 5.91 $ 6.24
Share price (in dollars per share) $ 6.94 $ 5.96 $ 5.91 $ 6.24
Volatility (as a percent) 93.00% 94.00% 91.00% 94.00%
Risk-free interest rate (as a percent) 2.94% 0.94% 2.41% 1.04%
Expected life (in years) 5 years 9 months 6 years 29 days 6 years 10 days 6 years 3 days
Dividend (as a percent) 0.00%   0.00% 0.00%