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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Share-based compensation |
Schedule of company's stock option plan | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise
Stock Option Plan Totals | ​ | Shares | ​ | 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) | ​ | $ | 4.20
-Exercised | ​ | (382,371) | ​ | $ | 1.16
-Granted | ​ | 379,070 | ​ | $ | 4.30
Outstanding at September 30, 2022, unaudited |  | 2,588,941 | ​ | $ | 1.47
(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.
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 |  | 2,419,701 |  | 5.7 | years | $ | 1.31

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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