v3.26.1
Financial liabilities - Disclosure of Changes in Liabilities Arising from Financing Activities (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Interest paid € (1,530) € (980) € (6,978)
Payment of lease liabilities (1,195) (1,080) (794)
Cash flows from financing activities 37,416 (5,135) 46,771
Foreign exchange gain (loss) (36) 6 16
Of which current 4,309 4,924  
Of which Non-Current 91,010 45,978  
Liabilities Related To Financing Activities      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 50,902 50,565  
Principal received / New contracts 40,249    
Decrease in loans and conditional advances (3,554) (3,075)  
Interest paid (1,520) (811)  
Payment of lease liabilities (1,195) (1,080)  
Cash flows from financing activities 33,981 (5,136)  
Indexation effect on current lease commitment 0 245  
Impact of discounting and catch-up 472 (2,833)  
Cumulative fixed interest expense accrual 3,091 1,808  
Cumulative variable interest expense accrual 7,288 6,254  
Foreign exchange gain (loss) (413)    
Non-cash from financing activities 10,437 5,474  
Liabilities arising from financing activities at end of period 95,320 50,902 50,565
Of which current 4,309    
Of which Non-Current 91,010    
Lease liabilities      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 4,230 5,081  
Principal received / New contracts 82    
Interest paid (130) (170)  
Payment of lease liabilities (1,195) (1,080)  
Cash flows from financing activities (1,243) (1,250)  
Indexation effect on current lease commitment   245  
Impact of discounting and catch-up (19) (16)  
Cumulative fixed interest expense accrual 0    
Cumulative variable interest expense accrual 130 169  
Non-cash from financing activities 111 398  
Liabilities arising from financing activities at end of period 3,099 4,230 5,081
Of which current 1,210    
Of which Non-Current 1,889    
Bpifrance advance | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 1,606 2,066  
Decrease in loans and conditional advances (921) (500)  
Cash flows from financing activities (921) (500)  
Impact of discounting and catch-up 5 12  
Cumulative fixed interest expense accrual 17 28  
Non-cash from financing activities 22 40  
Liabilities arising from financing activities at end of period 707 1,606 2,066
Of which current 707    
Curadigm Bpi advance | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 342 397  
Decrease in loans and conditional advances (125) (75)  
Cash flows from financing activities (125) (75)  
Impact of discounting and catch-up 15 20  
Non-cash from financing activities 15 20  
Liabilities arising from financing activities at end of period 232 342 397
Of which current 97    
Of which Non-Current 135    
HSBC “PGE” | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 1,891 3,155  
Decrease in loans and conditional advances (1,254) 1,250  
Interest paid (26) (48)  
Cash flows from financing activities (1,280) (1,298)  
Impact of discounting and catch-up (7) (13)  
Cumulative fixed interest expense accrual 26 48  
Non-cash from financing activities 19 35  
Liabilities arising from financing activities at end of period 630 1,891 3,155
Of which current 630    
Bpifrance “PGE” | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 2,198 3,457  
Decrease in loans and conditional advances (1,255) (1,250)  
Interest paid (36) (66)  
Cash flows from financing activities (1,291) (1,316)  
Impact of discounting and catch-up (2) (4)  
Cumulative fixed interest expense accrual 36 62  
Non-cash from financing activities 34 58  
Liabilities arising from financing activities at end of period 941 2,198 3,457
Of which current 941    
EIB Loan      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Of which Non-Current 18,100 19,000  
EIB Loan | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 40,635 36,409  
Decrease in loans and conditional advances 0    
Interest paid (1,328) (697)  
Cash flows from financing activities (1,328) (697)  
Impact of discounting and catch-up 480 (2,832)  
Cumulative fixed interest expense accrual 1,497 1,670  
Cumulative variable interest expense accrual 7,158 6,085  
Non-cash from financing activities 9,135 4,923  
Liabilities arising from financing activities at end of period 48,442 € 40,635 € 36,409
Of which current 725    
Of which Non-Current 47,717    
Royalty Financing      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Principal received / New contracts 40,167    
Cash flows from financing activities 40,167    
Cumulative fixed interest expense accrual 1,515    
Foreign exchange gain (loss) (413)    
Non-cash from financing activities 1,101    
Liabilities arising from financing activities at end of period 41,269    
Of which Non-Current € 41,269