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Operating expenses - Payroll Costs, Additional Information (Details) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 EUR (€) employee | Dec. 31, 2023 EUR (€) employee | Dec. 31, 2022 EUR (€) employee
Disclosure Of Operating Expenses [Line Items] |  |  |
Increase/ decrease in employee benefit expense | € (1,600) | € 100 |
Increase (decrease) in employee benefit expense, percentage | (15.10%) | 1.40% |
End of period headcount) (employee) | employee | 108 | 102 | 102
Share-based payments | € 4,298 | € 3,222 | € 3,174
Short-term employee benefits expense | 20,000 | 19,200 | € 17,300
Selling, general and administrative expense |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Increase/ decrease in employee benefit expense | € 200 | € 2,100 |
Increase (decrease) in employee benefit expense, percentage | 1.80% | 21.50% |
End of period headcount) (employee) | employee | 26 | 28 | 28
Share-based payments | € 3,800 | € 2,900 | € 2,800

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- Definition The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The number of personnel employed by the entity at a date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | na
Period Type: | instant

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- Definition The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Disclosure Of Operating Expenses + References No definition available. + Details
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- Definition Increase (Decrease) Payroll Expense + References No definition available. + Details
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- Definition Percentage Increase (Decrease) In Payroll Expense + References No definition available. + Details
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- Details
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