v3.26.1
Revenues - Narrative (Details) - EUR (€)
€ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Increase (decrease) in revenue from sale of goods € (27,000)  
Increase (decrease) in revenue from sales of goods, percentage (30.00%)  
Other revenues from contracts with customers € 1,570 € 6,152
Increase (decrease) in revenue € (31,700)  
IXIARO/ JESPECT    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Increase (decrease) in revenue from sales of goods, percentage (20.00%)  
Increase (decrease) in revenue through foreign exchange differences € (1,500)  
DUKORAL®    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Increase (decrease) in revenue from sales of goods, percentage (16.00%)  
Increase (decrease) in revenue through foreign exchange differences € (400)  
IXCHIQ®    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Increase (decrease) in revenue from sale of goods € (3,100)  
Third party products    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Increase (decrease) in revenue from sales of goods, percentage (92.00%)