v3.22.1
Shareholders' Equity - Additional paid-in capital (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Additional paid-in capital    
Beginning balance $ 112,600 $ 143,119
Share-based compensation expense 2,114 1,368
Exercise of stock options 49 19
Ending balance 100,756 131,992
Additional paid-in capital    
Additional paid-in capital    
Beginning balance 15,711 8,530
Share-based compensation expense 2,114 1,368
Exercise of stock options (40) (15)
Ending balance $ 17,785 $ 9,883