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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-based compensation |
Schedule of the activity for stock options issued | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise
Stock Option Plan Totals | ​ | Shares | ​ | Price
Outstanding at December 31, 2021 |  | 2,604,023 | ​ | $ | 1.03
-Cancelled | ​ | (11,781) | ​ | $ | 3.75
-Exercised | ​ | (583,273) | ​ | $ | 1.15
-Granted (1) | ​ | 381,181 | ​ | $ | 4.33
Outstanding at December 31, 2022 |  | 2,390,150 | ​ | $ | 1.51
-Cancelled | ​ | (26,150) | ​ | $ | 9.62
-Exercised | ​ | (275,405) | ​ | $ | 2.68
-Granted (2) | ​ | 592,798 | ​ | $ | 10.02
Outstanding at September 30, 2023, unaudited |  | 2,681,393 | ​ | $ | 3.26
(1) | Options to purchase 381,181 shares were granted in 2022, of which options to purchase 40,588 shares vested immediately in 2022 and the remainder vested 50% immediately and 50% one year after the date of the grants.
(2) | Options to purchase 575,098 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 nine- month vesting period.
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 |  | 2,444,022 |  | 4.64 | years | $ | 2.60

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