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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