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Share-based compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Share-based compensation |
Schedule of the activity for stock options issued | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise
Stock Options and Stock Appreciation Rights | ​ | Shares | ​ | Price
Outstanding at December 31, 2022 |  | 2,390,150 | ​ | $ | 1.51
-Cancelled | ​ | (48,268) | ​ | $ | 5.67
-Exercised | ​ | (296,973) | ​ | $ | 2.68
-Granted (1) | ​ | 602,526 | ​ | $ | 10.02
Outstanding at December 31, 2023 |  | 2,647,435 | ​ | $ | 3.31
-Cancelled | ​ | (450) | ​ | $ | 10.28
-Exercised | ​ | (25,876) | ​ | $ | 9.08
-Granted (2) | ​ | 42,791 | ​ | $ | 14.89
Outstanding at March 31, 2024 |  | 2,663,900 | ​ | $ | 3.44
(1) | Options to purchase 584,826 shares were granted in 2023, of which options to purchase 337,727 shares vested immediately in 2023 and the remainder vested 50% immediately and 50% one year after the date of the grants. In addition, 17,700 stock appreciation rights were granted in January 2023 with a six- month vesting period.
(2) | Options to purchase 42,791 shares were granted in 2024, of which 50% were vested immediately and the remainder vested 50% one year after the date of the grants.
Schedule of weighted average contractual life in years and the weighted average exercise price | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Weighted
​ | ​ | ​ | ​ | Remaining | ​ | Average
​ |  | Number of |  | Contractual |  | Exercise
​ | ​ | Options | ​ | Life | ​ | Price
Options outstanding and vested |  | 2,628,905 |  | 4.02 | years | $ | 3.31

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