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Share-based compensation (Tables) | 6 Months Ended
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Jun. 30, 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 | ​ | (750) | ​ | $ | 10.28
-Exercised | ​ | (34,402) | ​ | $ | 7.68
-Granted (2) | ​ | 133,371 | ​ | $ | 10.85
Outstanding at June 30, 2024 |  | 2,745,654 | ​ | $ | 3.63
(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 133,371 shares were granted in 2024, of which options to purchase 111,975 shares vested immediately in 2024 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 | The following is the weighted average contractual life in years and the weighted average exercise price at June 30, 2024 of: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Weighted
​ | ​ | ​ | ​ | Remaining | ​ | Average
​ |  | Number of |  | Contractual |  | Exercise
​ | ​ | Options | ​ | Life | ​ | Price
Options outstanding and vested |  | 2,710,819 | ​ | 3.76 | years | $ | 3.50

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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