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Shareholders’ equity - Share capital issued (Details) - EUR (€) € / shares in Units, € in Thousands | Dec. 31, 2024 | Nov. 19, 2024 | Dec. 31, 2023 | Oct. 24, 2023 | May 24, 2023 | Feb. 22, 2023 | Dec. 31, 2022 | Sep. 07, 2022 | Dec. 31, 2021
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Equity [abstract] |  |  |  |  |  |  |  |  |  |  |
Share capital | € 633 |  | € 629 | [1] |  |  |  | € 223 | [1] |  |
Number of shares issued (in shares) | 63,347,837 |  | 62,928,818 |  |  |  |  | 22,313,185 |  |  | 16,764,051
Par value per share (in euro per share) | € 0.01 | € 0.01 | € 0.01 |  | € 0.01 | € 0.01 | € 0.01 | € 0.01 |  | € 0.01 |
Number of treasury shares held (in shares) | 0 |  | 11,339 |  |  |  |  | 12,000 |  |  |
Number of shares outstanding (in shares) | 63,347,837 |  | 62,917,479 |  |  |  |  | 22,301,185 |  |  |
[1] | 1 In application of the Amendments to IAS 1 Presentation of Financial Statements – Classification of Liabilities as Current or Non-current, and Non-current Liabilities with Covenants, the non-current portion of the OCEANE bonds as of December 31, 2022, amounting to €19,332 thousand, and the non-current portion of the Heights convertible notes as of December 31, 2023, amounting to €20,652 thousand, were reclassified within the current liabilities (Convertible loan notes) as of December 31, 2022 and 2023 respectively (see Note 2).

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