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Operating income - Narrative (Details) - EUR (€) € in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Operating Income [Line Items]
Research tax credit ("CIR")		€ 6,651	€ 4,493	€ 4,476
Subsidies		4,140	81	29
RNP-VIR conditional advance
Disclosure Of Operating Income [Line Items]
Subsidies	€ 1,872
CARENA conditional advance
Disclosure Of Operating Income [Line Items]
Subsidies	€ 2,251
Tax Year 2021
Disclosure Of Operating Income [Line Items]
Research tax credit ("CIR")		984		€ 4,476
Tax Year 2022
Disclosure Of Operating Income [Line Items]
Research tax credit ("CIR")			€ 4,493
Tax Year 2023
Disclosure Of Operating Income [Line Items]
Research tax credit ("CIR")		€ 5,668

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Disclosure Of Operating Income [Line Items]

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Income From Research Tax Credit

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The amount of income recognised in relation to government grants. [Refer: Government grants]

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