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Property, plant and equipment - Disclosure of reconciliation of property, plant and equipment (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | € 2,666 | € 878 |
Property, plant and equipment including right-of-use assets at end of period | 2,090 | 2,666 | € 878
Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 2,666 | 878 | 1,592
Property, plant and equipment including right-of-use assets at end of period | 2,090 | 2,666 | 878
ROU |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 1,950 | 501 | 1,270
Property, plant and equipment including right-of-use assets at end of period | 1,563 | 1,950 | 501
BUILDINGS | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 2,205 | 509 | 1,359
Property, plant and equipment including right-of-use assets at end of period | 1,706 | 2,205 | 509
EQUIPMENT | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 94 | 126 | 59
Property, plant and equipment including right-of-use assets at end of period | 59 | 94 | 126
FURNITURE AND COMPUTER EQUIPMENT | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 366 | 242 | 175
Property, plant and equipment including right-of-use assets at end of period | 325 | 366 | 242
GROSS VALUES | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 4,029 | 2,366 | 2,400
Acquisition | 559 | 2,870 | 614
Disposal | (252) | (1,229) | (649)
Effect of the change in foreign currency exchange rates | (62) | 22 |
Property, plant and equipment including right-of-use assets at end of period | 4,274 | 4,029 | 2,366
GROSS VALUES | ROU |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 2,526 | 1,262 | 1,561
Acquisition | 424 | 2,217 | 350
Disposal | (34) | (975) | (649)
Effect of the change in foreign currency exchange rates | (50) | 22 |
Property, plant and equipment including right-of-use assets at end of period | 2,865 | 2,526 | 1,262
GROSS VALUES | BUILDINGS | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 2,818 | 1,346 | 1,618
Acquisition | 436 | 2,578 | 350
Disposal | 0 | (1,110) | (622)
Effect of the change in foreign currency exchange rates | (50) | 4 |
Property, plant and equipment including right-of-use assets at end of period | 3,204 | 2,818 | 1,346
GROSS VALUES | EQUIPMENT | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 513 | 513 | 436
Acquisition | 0 | 0 | 103
Disposal | (49) | 0 | (27)
Effect of the change in foreign currency exchange rates | 0 | 0 |
Property, plant and equipment including right-of-use assets at end of period | 463 | 513 | 513
GROSS VALUES | FURNITURE AND COMPUTER EQUIPMENT | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | 698 | 507 | 346
Acquisition | 123 | 292 | 161
Disposal | (203) | (119) | 0
Effect of the change in foreign currency exchange rates | (12) | 17 |
Property, plant and equipment including right-of-use assets at end of period | 607 | 698 | 507
DEPRECIATION | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | (1,363) | (1,488) | (808)
Increase | (1,095) | (1,089) | (707)
Disposal | 252 | 1,215 | 27
Effect of the change in foreign currency exchange rates | 22 |  |
Property, plant and equipment including right-of-use assets at end of period | (2,184) | (1,363) | (1,488)
DEPRECIATION | ROU |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | (575) | (761) | (290)
Increase | (797) | (788) | (498)
Disposal | 53 | 975 | 27
Effect of the change in foreign currency exchange rates | 17 |  |
Property, plant and equipment including right-of-use assets at end of period | (1,302) | (575) | (761)
DEPRECIATION | BUILDINGS | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | (613) | (837) | (259)
Increase | (903) | (886) | (578)
Disposal | 0 | 1,111 | 0
Effect of the change in foreign currency exchange rates | 17 |  |
Property, plant and equipment including right-of-use assets at end of period | (1,498) | (613) | (837)
DEPRECIATION | EQUIPMENT | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | (419) | (387) | (378)
Increase | (35) | (32) | (36)
Disposal | 49 | 0 | 27
Effect of the change in foreign currency exchange rates | 0 |  |
Property, plant and equipment including right-of-use assets at end of period | (404) | (419) | (387)
DEPRECIATION | FURNITURE AND COMPUTER EQUIPMENT | Property, plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period | (332) | (265) | (171)
Increase | (158) | (171) | (94)
Disposal | 203 | 104 | 0
Effect of the change in foreign currency exchange rates | 5 |  |
Property, plant and equipment including right-of-use assets at end of period | € (281) | € (332) | € (265)

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- Definition The amount of additions to property, plant and equipment including right-of-use assets other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The decrease in property, plant and equipment including right-of-use assets resulting from disposals. [Refer: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in property, plant and equipment including right-of-use assets resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of property, plant and equipment including right-of-use assets whose underlying assets would be presented as property, plant and equipment if they were owned. [Refer: Property, plant and equipment; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_47_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_a&doctype=Standard -URIDate 2025-03-27 + Details
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