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Capital - Additional Information (Details) - EUR (€) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of changes in the share capital |  |  |  |
Total shareholders’ equity | € 28,796,000 | € 57,863,000 | € 51,901,000 | € 54,151,000
Exercise and subscription of equity instruments | € 93,000 | 348,000 |  |
Number of own shares (in shares) | 18,575 |  | 18,575 |
BSAAR 2012 |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Number of equity instruments converted in ordinary shares (in shares) | 38,100 |  |  |
Share issued, price per share (in EUR per share) | € 2.45 |  |  |
Company saving plan |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Exercise and subscription of equity instruments (in shares) | 106,844 |  |  |
Company saving plan, employer top-up |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Exercise and subscription of equity instruments (in shares) | 68,744 |  |  |
Ordinary Shares |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Number of shares outstanding (in shares) | 80,967,407 |  |  |
Par value per share (in EUR per share) | € 0.05 |  |  |
The 2016 free preferred shares |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Par value per share (in EUR per share) | € 0.05 |  |  |
Total number of shares issued (in shares) | 6,509 |  |  |
The 2017 free preferred shares |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Par value per share (in EUR per share) | € 0.05 |  |  |
Total number of shares issued (in shares) | 7,581 |  |  |
Share capital |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Total shareholders’ equity | € 4,049,075 | 4,027,000 | € 4,044,000 | € 4,011,000
Exercise and subscription of equity instruments | € 5,342 | € 15,000 |  |
Share capital | Ordinary Shares |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Total number of shares issued (in shares) | 80,967,407 | 80,516,622 | 80,860,563 | 80,212,069
Exercise and subscription of equity instruments (in shares) | 106,844 | 304,553 |  |
Share premium |  |  |  |
Disclosure of changes in the share capital |  |  |  |
Total shareholders’ equity | € 386,049,000 | € 381,371,000 | € 384,255,000 | € 379,637,000
Exercise and subscription of equity instruments | € 88,003 | € 333,000 |  |

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