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Significant events for the years ended December 31, 2023, 2024 and 2025 and subsequent events - Subsequent events (Details) € in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended | 30 Months Ended | 110 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 23, 2026 EUR (€) shares | Feb. 28, 2026 shares | Apr. 30, 2025 shares | Jan. 31, 2025 shares | Dec. 31, 2023 shares | Dec. 31, 2025 shares | Dec. 31, 2023 | Dec. 31, 2025 shares | Dec. 31, 2025 shares
Free shares (AGA) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  | 2,601,296 | 6,280,727 |  | 10,828,148 |
BSAs |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  | 39,370 | 125,000 |  | 164,370 |  |  | 486,714
BSAs | Board member |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 25.00% | 25.00% |  |  |  |  |
Vesting period |  |  | 4 years | 4 years |  |  |  |  |
BSAs | Tranche 1 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  | 25.00% |  |
Vesting period |  |  |  |  |  | 1 year |  |  |
BSAs | Tranche 2 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  | 75.00% |  |
Vesting period |  |  |  |  |  |  | 4 years |  |
Major share-based transactions | Free shares (AGA) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  | 47,500 |  |  |  |  |  |  |
Major share-based transactions | Free shares (AGA) | Tranche 1 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |  |  |  |
Vesting period |  | 2 years |  |  |  |  |  |  |
Major share-based transactions | Free shares (AGA) | Tranche 2 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |  |  |
Major share-based transactions | Free shares (AGA) | Tranche 3 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |
Major share-based transactions | BSAs |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  | 23,477 |  |  |  |  |  |  |
Major share-based transactions | BSAs | Board member |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |
CSO, settlement agreement |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Termination benefits | € | € 278 |  |  |  |  |  |  |  |
Contractual severance indemnity | € | € 240 |  |  |  |  |  |  |  |
CSO, settlement agreement | Free shares (AGA) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Number of shares waived (in shares) | 77,050 |  |  |  |  |  |  |  |
Number of shares with performance conditions waived (in shares) | 40,200 |  |  |  |  |  |  |  |
Number of shares lapsed (in shares) | 217,750 |  |  |  |  |  |  |  |

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