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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

X

- 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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X

- 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

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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

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- Definition

The increase (decrease) in intangible assets other than goodwill resulting from transfers. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

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X

- 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
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-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

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- References

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- Definition

Additions Other Than Through Business Combinations, Intangible Assets Other Than Goodwill, Net

+ References

No definition available.

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