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Share-based compensation - Fair value measurement (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) Y $ / shares | Dec. 31, 2021 USD ($) Y $ / shares | Dec. 31, 2020 USD ($) Y $ / shares
NL & US |  |  |
Share-based compensation |  |  |
Expected annual volatility | 83.90% |  |
Expected life, years | Y | 6.08 |  |
Weighted average grant date fair value | $ | $ 4.01 |  |
NL & US | Bottom of range |  |  |
Share-based compensation |  |  |
Fair value of the common share | $ 1.71 |  |
Exercise price | $ 2.34 |  |
Risk-free interest rate | 1.65% |  |
NL & US | Top of range |  |  |
Share-based compensation |  |  |
Fair value of the common share | $ 3.91 |  |
Exercise price | $ 5.50 |  |
Risk-free interest rate | 3.78% |  |
NL |  |  |
Share-based compensation |  |  |
Expected annual volatility |  | 80.10% |
Expected life, years | Y |  | 6.08 | 3.92
Exercise price |  |  | $ 0
Risk-free interest rate |  |  | 0.62%
Weighted average grant date fair value | $ |  | $ 3.61 | $ 2.71
NL | Bottom of range |  |  |
Share-based compensation |  |  |
Expected annual volatility |  |  | 75.50%
Fair value of the common share |  | $ 3.42 | $ 2.10
Exercise price |  | $ 5.10 |
Risk-free interest rate |  | 0.30% |
NL | Top of range |  |  |
Share-based compensation |  |  |
Expected annual volatility |  |  | 90.00%
Fair value of the common share |  | $ 5.23 | $ 2.76
Exercise price |  | $ 7.77 |
Risk-free interest rate |  | 0.53% |
US |  |  |
Share-based compensation |  |  |
Expected annual volatility |  | 80.10% |
Expected life, years | Y |  | 6.08 |
Weighted average grant date fair value | $ |  | $ 5.95 |
US | Bottom of range |  |  |
Share-based compensation |  |  |
Fair value of the common share |  | $ 3.12 |
Exercise price |  | $ 5.10 |
Risk-free interest rate |  | 0.94% |
US | Top of range |  |  |
Share-based compensation |  |  |
Fair value of the common share |  | $ 8.71 |
Exercise price |  | $ 15.00 |
Risk-free interest rate |  | 1.34% |

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 2022-03-24 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2022-03-24 + Details
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X
- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2022-03-24 + Details
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X
- 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 2022-03-24 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The exercise price of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2022-03-24 + Details
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X
- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a&doctype=Standard -URIDate 2022-03-24 + Details
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X
- 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 2022-03-24 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2022-03-24 + Details
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