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Intangible assets - Disclosure of reconciliation of intangible assets (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | € 6,606 | € 6,604 | € 6,607
Intangible assets other than goodwill at end of period | 6,605 | 6,606 | 6,604
LICENSES |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | 75 | 75 | 75
Intangible assets other than goodwill at end of period | 75 | 75 | 75
SOFTWARE |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | 3 | 0 | 3
Intangible assets other than goodwill at end of period | 2 | 3 | 0
PATENTS |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | 6,529 | 6,529 | 6,529
Intangible assets other than goodwill at end of period | 6,529 | 6,529 | 6,529
GROSS VALUES |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | 6,677 | 6,673 | 6,673
Acquisition |  | 3 |
Intangible assets other than goodwill at end of period | 6,677 | 6,677 | 6,673
GROSS VALUES | LICENSES |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | 120 | 120 | 120
Acquisition |  | 0 |
Intangible assets other than goodwill at end of period | 120 | 120 | 120
GROSS VALUES | SOFTWARE |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | 27 | 24 | 24
Acquisition |  | 3 |
Intangible assets other than goodwill at end of period | 27 | 27 | 24
GROSS VALUES | PATENTS |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | 6,529 | 6,529 | 6,529
Acquisition |  | 0 |
Intangible assets other than goodwill at end of period | 6,529 | 6,529 | 6,529
AMORTIZATION |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | (70) | (70) | (66)
Increase | (1) | (1) | (3)
Intangible assets other than goodwill at end of period | (71) | (70) | (70)
AMORTIZATION | LICENSES |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | (45) | (45) | (45)
Increase | 0 | 0 | 0
Intangible assets other than goodwill at end of period | (45) | (45) | (45)
AMORTIZATION | SOFTWARE |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | (25) | (24) | (21)
Increase | (1) | (1) | (3)
Intangible assets other than goodwill at end of period | (26) | (25) | (24)
AMORTIZATION | PATENTS |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Intangible assets other than goodwill at beginning of period | 0 | 0 | 0
Increase | 0 | 0 | 0
Intangible assets other than goodwill at end of period | € 0 | € 0 | € 0

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2025-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e_i&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2025-01-01 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_e&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_c&doctype=Standard -URIDate 2025-03-27 + Details
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