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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-based compensation |
Schedule of information about share-based awards | The following table provides information about share-based awards as of December 31, 2022 and 2021:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2018 Stock Option Plan | ​ | 2020 U.S. Stock Option Plan | ​ | 2021 Long-term Incentive Option Plan
​ |  | ​ |  | ​ |  | Weighted |  | ​ |  | ​ |  | Weighted |  | ​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​ | Weighted | ​ | average
​ | ​ | Number | ​ | average | ​ | remaining | ​ | ​ | ​ | average | ​ | remaining | ​ | ​ | ​ | average | ​ | remaining
​ | ​ | of | ​ | exercise | ​ | contractual | ​ | Number of | ​ | exercise | ​ | contractual | ​ | Number of | ​ | exercise | ​ | contractual
​ | ​ | options | ​ | price $ |  | term (yrs) | ​ | options | ​ | price $ |  | term (yrs) | ​ | options | ​ | price $ |  | term (yrs)
Outstanding at January 1, 2021 |  | 620,347 |  | 0.01 |  | (*) |  | 1,069,198 |  | 2.76 |  | 9.50 |  | — |  | — |  | —
Granted |  | — |  | — |  | ​ | ​ | 493,938 |  | 12.69 |  | 9.21 | ​ | 1,307,150 |  | 6.03 |  | 9.90
Exercised |  | — |  | — |  | ​ | ​ | — |  | — |  | ​ | ​ | — |  | — |  | ​
Forfeited |  | — |  | — |  | ​ | ​ | — |  | — |  | ​ | ​ | — |  | — |  | ​
Outstanding at December 31, 2021 |  | 620,347 |  | 0.01 |  | (*) |  | 1,563,136 |  | 5.90 |  | 8.90 |  | 1,307,150 |  | 6.03 |  | 9.90
Granted |  | — |  | — |  | ​ | ​ | — |  | — |  | ​ | ​ | 2,358,458 |  | 4.01 | ​ | 9.79
Exercised |  | (16,073) |  | 0.01 |  | ​ | ​ | (6,124) |  | 2.76 |  | ​ | ​ | — |  | — |  |
Forfeited |  | (3,817) |  | 0.01 |  | ​ | ​ | (284,933) |  | 13.46 |  | ​ | ​ | (258,014) |  | 5.75 |  |
Outstanding at December 31, 2022 |  | 600,457 |  | 0.01 |  | (*) |  | 1,272,079 |  | 4.22 |  | 7.83 |  | 3,407,594 |  | 4.66 |  | 9.54
Exercisable at December 31, 2022 |  | 387,565 |  | ​ |  | ​ | ​ | 717,532 |  | ​ |  |  | ​ | 470,454 |  | ​ |  |
(*) contract term does not have fixed end date
​
Schedule of assumptions used in the measurement of the fair values and the weighted average fair value of the share options granted | The assumptions used in the measurement of the fair values and the weighted average fair value of the share options granted during the years ended on December 31, 2022, 2021 and 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 | ​ | December 31, 2021 | ​ | December 31, 2020
​ |  | NL & US |  | NL |  | US | ​ | NL
Expected annual average volatility | ​ | ​ | 83.9% | ​ | ​ | 80.1% | ​ | ​ | 80.1% | ​ | ​ | 75.5% - 90.0%
Expected life, years | ​ | ​ | 6.08 | ​ | ​ | 6.08 | ​ | ​ | 6.08 | ​ | ​ | 3.92
Fair value of the common share | ​ | $ | 1.71 - 3.91 | ​ | $ | 3.42 - 5.23 | ​ | $ | 3.12 - 8.71 | ​ | $ | 2.10 - 2.76
Exercise price | ​ | $ | 2.34 - 5.50 | ​ | $ | 5.10 - 7.77 | ​ | $ | 5.10 - 15.00 | ​ | $ | 0
Dividend yield | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Risk-free interest rate | ​ | ​ | 1.65% - 3.78% | ​ | ​ | (0.30%) - (0.53%) | ​ | ​ | 0.94% - 1.34% | ​ | ​ | (0.62%)
Weighted average grant date fair value | ​ | $ | 4.01 | ​ | $ | 3.61 | ​ | $ | 5.95 | ​ | $ | 2.71
​

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