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Share-based payments - Estimated the fair value of the share options granted (Details) |  |  |  |  |  |  | 12 Months Ended
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Nov. 16, 2023 Options Y $ / shares | Sep. 08, 2023 Options Y $ / shares | Jun. 12, 2023 Options Y $ / shares | Mar. 22, 2023 Y Options $ / shares | Dec. 20, 2022 Y Options $ / shares | Aug. 15, 2022 Y Options $ / shares | Dec. 31, 2023 Options | Dec. 31, 2022 Options
Share-based payments |  |  |  |  |  |  |  |
Exercise price | $ / shares | $ 12.41 | $ 12.38 | $ 19.87 | $ 13.39 | $ 12.46 | $ 9.20 |  |
Expected volatility | 70.00% | 69.00% | 70.00% | 70.00% | 71.00% | 68.00% |  |
Expected life of options | Y | 6 | 6 | 6 | 6 | 6 | 6 |  |
Risk-free interest rate | 4.16% | 3.71% | 3.22% | 3.38% | 2.95% | 2.76% |  |
Number of share options issued | Options | 14,300 | 7,650 | 23,450 | 13,900 | 4,000 | 25,200 | 59,300 | 29,200

X
- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2023-03-23 + Details
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- References No definition available. + Details
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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2023-03-23 + Details
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