v3.26.1
Intangible assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Intangible assets      
Balance at the beginning € 48 € 541 € 568
Increases 41 (493) (27)
Decreases (7)    
Balance at the end 182 48 541
Gross      
Intangible assets      
Balance at the beginning 3,947 3,926 3,732
Increases 153 21 194
Decreases (7)    
Balance at the end 4,094 3,947 3,926
Amortization and impairment      
Intangible assets      
Balance at the beginning (3,899) (3,384) (3,164)
Increases (112) (514) (221)
Balance at the end (3,911) (3,899) (3,384)
Library of compounds | Gross      
Intangible assets      
Balance at the beginning 2,142 2,142 2,142
Balance at the end 2,142 2,142 2,142
Library of compounds | Amortization and impairment      
Intangible assets      
Balance at the beginning (2,141) (1,816) (1,651)
Increases   (325) (165)
Balance at the end (2,141) (2,141) (1,816)
Software licenses | Gross      
Intangible assets      
Balance at the beginning 1,806 1,784 1,590
Increases   21 194
Decreases (7)    
Balance at the end 1,798 1,806 1,784
Software licenses | Amortization and impairment      
Intangible assets      
Balance at the beginning (1,757) (1,568) (1,512)
Increases (112) (189) (56)
Balance at the end (1,770) € (1,757) € (1,568)
Intangible assets in progress      
Intangible assets      
Intangible assets acquired 200    
Intangible assets in progress | Gross      
Intangible assets      
Increases 153    
Balance at the end € 153