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Financial liabilities - Disclosure of conditional advances (Details) - EUR (€) € in Thousands	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]
Conditional advances	€ 0	€ 0		€ 6,771
RNP VIR – Bpifrance
Disclosure of detailed information about borrowings [line items]
Conditional advances	0	0	€ 2,945	4,232
CARENA – Bpifrance
Disclosure of detailed information about borrowings [line items]
Conditional advances	0	0	€ 3,255	2,485
EBOLA – Bpifrance
Disclosure of detailed information about borrowings [line items]
Conditional advances	€ 0	€ 0		€ 55

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- Definition

Conditional Advances

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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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.

+ Details

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- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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