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Operating expenses - Disclosure of Research and Development Expense (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Analysis of income and expense [abstract] |  |  |
Purchases, sub-contracting and other expenses | € (27,048) | € (26,380) | € (20,415)
Payroll costs (including share-based payments) | (12,345) | (10,721) | (10,868)
Depreciation, amortization and provision expenses | (1,148) | (1,295) | (1,353)
Research and development expenses | € (40,541) | € (38,396) | € (32,636)

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- Definition The amount of expenditure directly attributable to research or development activities, recognised in profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 126 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_126&doctype=Standard -URIDate 2024-03-27 + Details
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