v3.26.1
Leases (right of use assets) - Schedule of reconciliation of right-of-use assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning period € 19,232 € 20,392
Revaluation due to variable payments 0 0
Termination of contracts (27) (1,100)
Right-of-use assets, ending period 18,558 19,232
Land, buildings and leasehold improvements    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning period 18,932 20,141
Additions 12 38
Amortization (1,725) (1,788)
Impairment charge 0  
Impairment charge   980
Revaluation due to variable payments 58 1,404
Termination of contracts 0 (1,246)
Exchange rate differences 916 (596)
Right-of-use assets, ending period 18,193 18,932
Manufacturing and laboratory equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning period 0 0
Additions 78 0
Amortization (8) 0
Impairment charge 0  
Impairment charge   0
Revaluation due to variable payments 0 0
Termination of contracts (71) 0
Exchange rate differences 2 0
Right-of-use assets, ending period 0 0
Furniture, fittings and other    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning period 300 251
Additions 280 199
Amortization (186) (135)
Impairment charge 0  
Impairment charge   0
Revaluation due to variable payments (2) 0
Termination of contracts (26) (12)
Exchange rate differences (2) (3)
Right-of-use assets, ending period 365 300
Total assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Additions 369 237
Amortization (1,919) (1,923)
Impairment charge 0  
Impairment charge   980
Revaluation due to variable payments 56 1,404
Termination of contracts (97) (1,258)
Exchange rate differences € 916 € (599)