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Financial liabilities - Schedule of Changes in Liabilities Arising from Financing Activities (Details) - EUR (€)
€ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Liabilities Arising From Financing Activities [Roll Forward]    
Interest paid € (336) € (609)
Payment of lease liabilities (568) (521)
Cash flows used in financing activities (2,830) (2,655)
Liabilities Related to Financing Activities    
Liabilities Arising From Financing Activities [Roll Forward]    
Liabilities arising from financing activities at beginning of period   50,902
Principal received 0  
Decrease in loans and conditional advances (1,927)  
Interest paid (335)  
Payment of lease liabilities (568)  
Cash flows used in financing activities (2,831)  
Indexation effect on current lease commitment 0  
Impact of discounting and catch-up (1,031)  
Accumulated fixed interest expense accrual 822  
Accumulated variable interest expense accrual 3,377  
Non-cash from financing activities 3,169  
Liabilities arising from financing activities at end of period 51,240  
Of which Current 4,735  
Of which Non-Current 46,505  
Lease liabilities    
Liabilities Arising From Financing Activities [Roll Forward]    
Liabilities arising from financing activities at beginning of period   4,230
Principal received 0  
Decrease in loans and conditional advances 0  
Interest paid (69)  
Payment of lease liabilities (568)  
Cash flows used in financing activities (637)  
Indexation effect on current lease commitment 0  
Impact of discounting and catch-up 0  
Accumulated fixed interest expense accrual 38  
Accumulated variable interest expense accrual 0  
Non-cash from financing activities 38  
Liabilities arising from financing activities at end of period 3,632  
Of which Current 1,247  
Of which Non-Current 2,385  
Bpifrance advance | Long-term borrowings    
Liabilities Arising From Financing Activities [Roll Forward]    
Liabilities arising from financing activities at beginning of period   1,606
Principal received 0  
Decrease in loans and conditional advances (600)  
Interest paid 0  
Payment of lease liabilities 0  
Cash flows used in financing activities (600)  
Indexation effect on current lease commitment 0  
Impact of discounting and catch-up 3  
Accumulated fixed interest expense accrual 10  
Accumulated variable interest expense accrual 0  
Non-cash from financing activities 13  
Liabilities arising from financing activities at end of period 1,019  
Of which Current 438  
Of which Non-Current 581  
Curadigm Bpi advance | Long-term borrowings    
Liabilities Arising From Financing Activities [Roll Forward]    
Liabilities arising from financing activities at beginning of period   342
Principal received 0  
Decrease in loans and conditional advances (75)  
Interest paid 0  
Payment of lease liabilities 0  
Cash flows used in financing activities (75)  
Indexation effect on current lease commitment 0  
Impact of discounting and catch-up 8  
Accumulated fixed interest expense accrual 0  
Accumulated variable interest expense accrual 0  
Non-cash from financing activities 8  
Liabilities arising from financing activities at end of period 275  
Of which Current 97  
Of which Non-Current 178  
HSBC “PGE” | Long-term borrowings    
Liabilities Arising From Financing Activities [Roll Forward]    
Liabilities arising from financing activities at beginning of period   1,891
Principal received 0  
Decrease in loans and conditional advances (626)  
Interest paid (11)  
Payment of lease liabilities 0  
Cash flows used in financing activities (638)  
Indexation effect on current lease commitment 0  
Impact of discounting and catch-up (4)  
Accumulated fixed interest expense accrual 11  
Accumulated variable interest expense accrual 0  
Non-cash from financing activities 7  
Liabilities arising from financing activities at end of period 1,260  
Of which Current 1,260  
Of which Non-Current 0  
Bpifrance “PGE” | Long-term borrowings    
Liabilities Arising From Financing Activities [Roll Forward]    
Liabilities arising from financing activities at beginning of period   2,198
Principal received 0  
Decrease in loans and conditional advances (626)  
Interest paid (22)  
Payment of lease liabilities 0  
Cash flows used in financing activities (648)  
Indexation effect on current lease commitment 0  
Impact of discounting and catch-up (1)  
Accumulated fixed interest expense accrual 21  
Accumulated variable interest expense accrual 0  
Non-cash from financing activities 19  
Liabilities arising from financing activities at end of period 1,569  
Of which Current 1,262  
Of which Non-Current 307  
EIB Loan    
Liabilities Arising From Financing Activities [Roll Forward]    
Liabilities arising from financing activities at beginning of period   € 40,635
Principal received 0  
Decrease in loans and conditional advances 0  
Interest paid (233)  
Payment of lease liabilities 0  
Cash flows used in financing activities (233)  
Indexation effect on current lease commitment 0  
Impact of discounting and catch-up (1,036)  
Accumulated fixed interest expense accrual 742  
Accumulated variable interest expense accrual 3,377  
Non-cash from financing activities 3,083  
Liabilities arising from financing activities at end of period 43,484  
Of which Current 430  
Of which Non-Current € 43,054