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Intangible assets - Narrative (Details) - EUR (€) € in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Apr. 01, 2022
Prosynergia
Disclosure of detailed information about intangible assets [line items]
Patents					€ 6,529
Exclusive licensing contract with the Scripps Research Institute, University of Chicago and Brigham Young University
Disclosure of detailed information about intangible assets [line items]
Collaboration agreements, development milestone payment, IND approval	€ 45
Exclusive licensing agreement with CNRS, University of Montpellier and Institut Curie
Disclosure of detailed information about intangible assets [line items]
Collaboration agreements, development milestone payment, Phase 2	€ 40
Wittycel SAS
Disclosure of detailed information about intangible assets [line items]
Intangible assets with indefinite useful life				€ 0
Impairment		€ 0	€ 0	€ 45

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Collaboration Agreements, Development Milestone Payment, IND Approval

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Technology-Based Intangible Assets, Assets Acquisitions

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The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill]

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The amount of intangible assets assessed as having an indefinite useful life. [Refer: Intangible assets other than goodwill]

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