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Financial liabilities - Change in derivative instruments (Details) - EUR (€) € in Thousands		12 Months Ended
	May 24, 2023	Dec. 31, 2024	Dec. 31, 2022	Dec. 31, 2023	Aug. 24, 2023	Aug. 20, 2023
Disclosure of detailed information about financial instruments [line items]
Exercises of share warrants	€ 1,850	€ 45	€ 3
Financial liabilities, at fair value		€ 162,256	€ 58,469	€ 125,191
Kreos A & B BSA
Disclosure of detailed information about financial instruments [line items]
Exercises of share warrants	€ 1,850
Financial liabilities, at fair value						€ 23,995
Oceane
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value					€ 1,762

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2024-01-01
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- Definition

The increase (decrease) in equity resulting from the exercise of warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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