v3.22.1
Share Based Compensation - Non-vested share options (Details) - $ / shares
 3 Months Ended
Feb. 16, 2022
Mar. 31, 2022
Mar. 31, 2021
Option Plans 2011 and 2019      
Number of options      
Non-vested share options at end of period   3,550,369 3,427,110
Weighted average fair value      
Non-vested at end of period   $ 5.51 $ 6.08
2011 Plan      
Number of options      
Non-vested at beginning of period   200,639 543,192
Vested, outstanding   (58,854) (93,087)
Non-vested share options at end of period   141,785 450,105
Weighted average fair value      
Non-vested at beginning of period   $ 1.86 $ 1.81
Vested, outstanding   1.74 1.61
Non-vested at end of period   $ 1.91 $ 1.85
2019 Plan      
Number of options      
Non-vested at beginning of period   2,665,518 1,438,026
Granted   1,385,700 1,863,950
Vested, outstanding   (642,634) (324,971)
Non-vested share options at end of period   3,408,584 2,977,005
Weighted average fair value      
Non-vested at beginning of period   $ 6.39 $ 10.28
Granted   4.13 4.79
Vested, outstanding   5.41 11.38
Non-vested at end of period   $ 5.66 $ 6.72
2021 Plan      
Number of options      
Granted   330,000  
Non-vested share options at end of period   330,000  
Weighted average fair value      
Granted $ 4.99