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Intangible assets (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets at beginning of period | € 8 | € 1
Increases | (2) |
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Intangible assets at end of period | 7 | 8
Gross book value of intangible assets | Patents |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets at beginning of period | 65 | 65
Increases | 0 | 0
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Intangible assets at end of period | 65 | 65
Gross book value of intangible assets | Software |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets at beginning of period | 667 | 658
Increases | 2 | 9
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Intangible assets at end of period | 669 | 667
Gross book value of intangible assets |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets at beginning of period | 732 | 723
Increases | 2 | 9
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Intangible assets at end of period | 734 | 732
Accumulated depreciation of intangible assets | Patents |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets at beginning of period | (65) | (65)
Increases | 0 | 0
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Intangible assets at end of period | (65) | (65)
Accumulated depreciation of intangible assets | Software |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets at beginning of period | (659) | (657)
Increases | (4) | (2)
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Intangible assets at end of period | (662) | (659)
Accumulated depreciation of intangible assets |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets at beginning of period | (724) | (721)
Increases | (4) | (2)
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Intangible assets at end of period | € (727) | (724)
Netting |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Increases |  | € 7

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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 2024-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill 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: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_c&doctype=Standard -URIDate 2024-03-27 + Details
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