v3.26.1
The company - Key events (Details)
12 Months Ended
Apr. 24, 2025
EUR (€)
€ / shares
shares
Apr. 23, 2025
EUR (€)
shares
Dec. 31, 2025
EUR (€)
shares
Dec. 31, 2024
EUR (€)
shares
Dec. 31, 2023
EUR (€)
shares
Sep. 17, 2025
Jan. 27, 2025
clinicalProductCandidate
Dec. 31, 2022
shares
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Number of patients planned to be enrolled in medical study | clinicalProductCandidate             105  
Increase capital, net     € 14,932,000 € 2,836,000 € 0      
Share capital € 4,609,489.9   € 4,686,661 € 4,192,000 € 4,044,000      
Total number of shares issued (in shares) | shares 92,189,798 83,844,411            
Expected decrease in number of employees, percentage           30.00%    
Common shares                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Total number of shares issued (in shares) | shares 92,175,723   93,719,000 83,830,000 80,861,000     80,212,000
2016 Preferred shares                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Total number of shares issued (in shares) | shares 6,494              
2017 Preferred shares                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Total number of shares issued (in shares) | shares 7,581              
Share capital                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Increase capital, net     € 417,000 € 92,000        
Share premium                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Increase capital, net     € 14,515,000 € 2,744,000        
Sanofi-Aventis                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Increase capital, net € 14,999,998.59              
Increase capital, net (in shares) | shares 8,345,387              
Share price (in EUR per share) | € / shares € 1.7974              
Sanofi-Aventis | Share capital                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Increase capital, net € 417,269.35              
Sanofi-Aventis | Share premium                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Increase capital, net € 14,582,729.24              
Maximum | Sanofi-Aventis | IPH6101 agreement, with Sanofi                
Disclosure of disaggregation of revenue from contracts with customers [line items]                
Increase capital, net   € 15,000,000