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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-based compensation |
Schedule of movement of the share options outstanding under the company's plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 |  | 2022
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | average | ​ | ​ | ​ | average
​ | ​ | Number of | ​ | exercise | ​ | Number of | ​ | exercise
​ |  | options |  | price |  | options |  | price
​ | ​ | ​ | ​ | $ | ​ | ​ |  | $
Balance – Beginning of year |  | 1,812,450 | ​ | 11.52 |  | 697,841 | ​ | 21.21
Granted |  | 1,202,400 | ​ | 6.59 |  | 1,245,400 | ​ | 6.43
Forfeited |  | (314,773) | ​ | 8.86 |  | (130,791) | ​ | 14.74
Balance – End of year |  | 2,700,077 | ​ | 9.64 |  | 1,812,450 | ​ | 11.52
Options exercisable – End of year |  | 735,050 | ​ | 14.18 |  | 205,229 | ​ | 21.32
Schedule of share options outstanding | The following table summarizes the share options outstanding as at December 31, 2023:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Options outstanding |  | Options exercisable
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | ​ | ​ | average | ​ | ​ | ​ | average
​ | ​ | Exercise | ​ | ​ | ​ | remaining contractual | ​ | ​ | ​ | remaining contractual
Grant date |  | price |  | Number |  | life (years) | ​ | Number |  | life (years)
​ |  | $ | ​ | ​ |  | ​ | ​ | ​ | ​ |
December 22, 2020 |  | 22.86 | ​ | 320,032 |  | 1.98 | ​ | 217,391 | ​ | 1.98
February 5, 2021 |  | 24.30 | ​ | 10,533 |  | 2.10 | ​ | 3,511 | ​ | 2.10
June 23, 2021 |  | 21.30 | ​ | 157,086 |  | 2.48 | ​ | 107,079 | ​ | 2.48
August 16, 2021 |  | 16.89 | ​ | 31,199 |  | 2.63 | ​ | 20,801 | ​ | 2.63
November 12, 2021 |  | 16.20 | ​ | 37,894 |  | 2.87 | ​ | 25,266 | ​ | 2.87
June 30, 2022 |  | 6.49 | ​ | 748,233 |  | 3.50 | ​ | 266,766 | ​ | 3.50
November 18, 2022 |  | 6.28 | ​ | 282,700 |  | 3.88 | ​ | 94,236 | ​ | 3.88
April 3, 2023 | ​ | 6.59 | ​ | 1,112,400 | ​ | 4.26 | ​ | - | ​ | -
​ |  | 9.64 | ​ | 2,700,077 |  | 3.59 | ​ | 735,050 | ​ | 2.90
​
Schedule of measurement at fair value determined by the Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 | ​
Dividend per share |  | ​ | — |  | ​ | — | ​
Expected volatility |  | ​ | 66% | ​ | ​ | 64% | ​
Risk-free interest rate |  | ​ | 3.2% | ​ | ​ | 3.3% | ​
Expected life |  | ​ | 48 months | ​ | ​ | 47 months | ​
Weighted average share price | ​ | $ | 6.59 | ​ | $ | 6.43 | ​
Weighted average fair value of options granted | ​ | $ | 3.43 | ​ | $ | 3.27 | ​
Schedule of information about DSU and RSU | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022
​ |  | DSU(ii) |  | RSU |  | DSU(i) |  | RSU
Balance – Beginning of year |  | 206,426 |  | 1,054,194 |  | 79,781 |  | 345,377
Granted |  | 99,170 |  | 261,900 |  | 137,528 |  | 794,500
Settled |  | (10,883) |  | (95,459) |  | (10,883) |  | (49,118)
Forfeited |  | — |  | (142,350) |  | — |  | (36,565)
Balance – End of year |  | 294,713 |  | 1,078,285 |  | 206,426 |  | 1,054,194
Balance – Vested |  | 195,543 |  | — |  | 68,898 |  | —
| (i) | Unless otherwise decided by the board of directors of the Company, the DSU vest the day prior to the next annual general meeting and are payable in common shares, cash or a combination of common shares and cash, at the sole discretion of the Company, to each director when he or she leaves the board or is not re-elected. The value of the payout is determined by multiplying the number of DSU expected to be vested at the payout date by the closing price of the Company’s shares on the day prior to the grant date. The fair value is recognized over the vesting period. On the settlement date, one common share will be issued for each DSU, after deducting any income taxes payable on the benefit earned by the director that must be remitted by the Company to the tax authorities.

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