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Financial liabilities - Change in financial liabilities (Details) - EUR (€) € in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 24, 2023 | Jul. 30, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Net proceeds from the issuance of convertible bond loans |  |  | € 0 | € 55,841 | € 0
Repurchases |  |  |  | 2,591 |
Repayments of convertible loan notes | € 33,000 |  | 8,750 | 27,188 | € 0
Proceeds from the issuance of non-convertible bond loans |  |  | 48,544 |  |
Oceane conversion option |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Repurchases |  |  |  | 1,762 |
Kreos / Claret convertible notes (OCABSA) |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Payments for debt issue costs |  |  |  | 1,881 |
Kreos & Claret financing, tranche B and C |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Payments for debt issue costs |  |  |  | 750 |
Heights convertible notes |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Payments for debt issue costs |  |  |  | 1,528 |
Oceane |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Net proceeds from the issuance of convertible bond loans |  | € 25,000 |  |  |
Repayments of convertible loan notes | € 25,102 |  |  | € 25,000 |
Kreos & Claret financing, tranche B |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Payments for debt issue costs |  |  | 1,475 |  |
Kreos & Claret financing, tranche C |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Payments for debt issue costs |  |  | 1,081 |  |
Kreos & Claret financing, tranche A-B |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Payments for debt issue costs |  |  | € 500 |  |

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