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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-based compensation |
Schedule of weighted-average assumptions used in determining fair value of share based awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended |  | ​ |  | ​ | ​ | ​ |
December 31, | ​ | 2023 | ​ | 2022 | ​ | 2021 |
Assumptions |  |  |  |  |  |  | ​
Dividend yield |  | 0 | % | 0 | % | 0 | %
Risk free interest rate |  | 3.69%-4.89 | % | 1.84%-4.27 | % | 0.29%-0.85 | %
Expected volatility |  | 71.73%-94 | % | 91%-94 | % | 90%-101 | %
Expected lives |  | 1.5-2.0 years |  | 1.5-2.75 years |  | 2.5-5 years | ​
Schedule of the activity for stock options issued | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
Stock Options and Stock Appreciation Rights | ​ | Shares | ​ | Exercise Price
Outstanding at December 31, 2020 |  | 5,329,515 | ​ | $ | 1.06
-Cancelled |  | (133,257) | ​ | $ | 2.02
-Exercised |  | (3,076,489) | ​ | $ | 1.16
-Granted (1) |  | 484,254 | ​ | $ | 1.82
Outstanding at December 31, 2021 |  | 2,604,023 | ​ | $ | 1.03
-Cancelled |  | (11,781) | ​ | $ | 3.75
-Exercised |  | (583,273) | ​ | $ | 1.15
-Granted (2) |  | 381,181 | ​ | $ | 4.33
Outstanding at December 31, 2022 | ​ | 2,390,150 | ​ | $ | 1.51
-Cancelled | ​ | (48,268) | ​ | $ | 5.67
-Exercised | ​ | (296,973) | ​ | $ | 2.68
-Granted (3) | ​ | 602,526 | ​ | $ | 10.02
Outstanding at December 31, 2023 |  | 2,647,435 | ​ | $ | 3.31
​ (1)Options to purchase 463,754 shares were granted in 2021, all of which were vested immediately in 2021. In addition, 20,500 stock appreciation rights were granted in December 2021 with a six- month vesting period. (2)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. (3)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.
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 December 31, 2023 and 2022 of: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Remaining | ​ | Weighted
​ | ​ | Number of | ​ | Contractual | ​ | Average
December 31, 2023 | ​ | Options | ​ | Life (Years) | ​ | Exercise Price
Options outstanding and vested |  | 2,400,336 |  | 4.47 | ​ | $ | 2.60
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Remaining | ​ | Weighted
​ | ​ | Number of | ​ | Contractual | ​ | Average
December 31, 2022 | ​ | Options | ​ | Life(Years) | ​ | Exercise Price
Options outstanding and vested |  | 2,218,799 |  | 5.39 | ​ | $ | 1.33
Schedule of intrinsic value | The intrinsic values of options vested and exercised during the years ended December 31, 2023, 2022 and 2021 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Intrinsic value of options vested | ​ | $ | 2,886,080 | ​ | $ | 1,249,506 | ​ | $ | 1,481,858
Intrinsic value of options exercised | ​ | $ | 2,565,056 | ​ | $ | 4,051,422 | ​ | $ | 7,088,578
​

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -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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- 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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