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Share-based payments - Schedule of Expense from Equity (Details) - EUR (€) € in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Disclosure Of Detailed Information About Share-based Payments [Line Items]
Expense for the year	€ 2,161	€ 1,940
BSPCE
Disclosure Of Detailed Information About Share-based Payments [Line Items]
Expense for the year	0	0
BSA
Disclosure Of Detailed Information About Share-based Payments [Line Items]
Expense for the year	0	0
OSA
Disclosure Of Detailed Information About Share-based Payments [Line Items]
Expense for the year	1,273	708
AGA
Disclosure Of Detailed Information About Share-based Payments [Line Items]
Expense for the year	€ 888	€ 1,232

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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 51
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_51_a&doctype=Standard
-URIDate 2025-03-27

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- Definition

Disclosure Of Detailed Information About Share-based Payments

+ References

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