v3.26.1
Results of operation - Revenue and Cost of goods sold (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
EUR (€)
customer
Jun. 30, 2025
EUR (€)
customer
Jun. 30, 2026
EUR (€)
customer
Jun. 30, 2025
EUR (€)
customer
Dec. 31, 2025
EUR (€)
Disclosure of research and development expenses [Line items]          
Revenue € 7,675,000 € 1,340,000 € 14,047,000 € 2,404,000  
Number of customers with individual sales larger than 10% | customer 0 2 0 2  
Percentage of entity's revenue 10.00%   10.00%    
Contract liability     € 1,000,000 € 900,000  
Non-current contract liability € 722,000   722,000   € 681,000
Non-current contract liability balance at the beginning of the period     324,000 165,000  
Purchases of goods and services 2,452,000 € 843,000 4,872,000 1,512,000  
Inventory movement 639,000 (353,000) 954,000 (616,000)  
Total cost of goods sold 3,091,000 490,000 5,826,000 896,000  
US          
Disclosure of research and development expenses [Line items]          
Revenue 5,197,000   9,451,000    
Germany          
Disclosure of research and development expenses [Line items]          
Revenue 1,391,000 1,175,000 2,615,000 2,104,000  
England          
Disclosure of research and development expenses [Line items]          
Revenue 481,000   658,000    
UAE          
Disclosure of research and development expenses [Line items]          
Revenue 469,000   814,000 32,000  
Switzerland          
Disclosure of research and development expenses [Line items]          
Revenue 24,000   357,000    
Netherlands          
Disclosure of research and development expenses [Line items]          
Revenue     39,000    
Austria          
Disclosure of research and development expenses [Line items]          
Revenue 37,000 € 165,000 37,000 € 268,000  
Spain          
Disclosure of research and development expenses [Line items]          
Revenue 3,000   3,000    
Italy          
Disclosure of research and development expenses [Line items]          
Revenue € 73,000   € 73,000