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Shareholders’ equity - Share capital issued (Details) - EUR (€) € / shares in Units, € in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Nov. 19, 2024 | Dec. 31, 2023 | Oct. 24, 2023 | May 24, 2023 | Feb. 22, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | --- | --- | ---
Equity [abstract] |  |  |  |  |  |  |  |
Share capital | € 785 | € 633 |  | € 629 |  |  |  |
Number of shares issued (in shares) | 78,536,412 | 63,347,837 |  | 62,928,818 |  |  |  | 22,313,185
Par value per share (in euro per share) | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 |
Number of treasury shares held (in shares) | 0 | 0 |  | 11,339 |  |  |  |

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