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Operating expenses - Disclosure of Depreciation, Amortization and Provision Expenses (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Operating Expenses [Line Items] |  |  |
Amortization expense of intangible assets | € (4) | € (1) | € (3)
Amortization expense of tangible assets | (1,618) | (1,517) | (1,497)
Reversal of provision for disputes and charges | 212 |  | 0
Provision for disputes and charges | (206) | (163) | (230)
Reversal of provision for disputes |  |  | 0
Total depreciation, amortization and provision expenses (except IAS 19) | (1,616) | (1,682) | (1,730)
Provision for retirement benefit obligations (IAS 19) |  | (65) | (75)
Total Provision for retirement benefit obligations (IAS 19) | (65) | (65) | (75)
Total depreciation, amortization and provision expenses | (1,681) | (1,747) | (1,805)
R&D |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Amortization expense of intangible assets | (3) | (1) | (2)
Amortization expense of tangible assets | (1,300) | (1,247) | (1,164)
Reversal of provision for disputes and charges | 160 |  | 0
Provision for disputes and charges | (6) | (47) | (187)
Reversal of provision for disputes |  |  | 0
Total depreciation, amortization and provision expenses (except IAS 19) | (1,148) | (1,295) | (1,353)
Provision for retirement benefit obligations (IAS 19) |  | (42) | (48)
Total Provision for retirement benefit obligations (IAS 19) | (45) | (42) | (48)
Total depreciation, amortization and provision expenses | (1,193) | (1,337) | (1,401)
SG&A |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Amortization expense of intangible assets | (1) | 0 | (1)
Amortization expense of tangible assets | (318) | (270) | (334)
Reversal of provision for disputes and charges | 52 |  | 0
Provision for disputes and charges | (200) | (116) | (43)
Reversal of provision for disputes |  |  | 0
Total depreciation, amortization and provision expenses (except IAS 19) | (467) | (387) | (378)
Provision for retirement benefit obligations (IAS 19) |  | (24) | (26)
Total Provision for retirement benefit obligations (IAS 19) | (20) | (24) | (26)
Total depreciation, amortization and provision expenses | € (487) | € (411) | € (404)

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- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + 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 The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + 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 The increase in existing other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84_c&doctype=Standard -URIDate 2024-03-27 + Details
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