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Financial liabilities - Disclosure of Detailed Information about Conditional Advances and Loans From Government and Public Authorities (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Conditional Advances and Loans from Government and Public Authorities    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities at beginning of period € 38,872 € 38,512
Principal received 0 150
Impact of discounting and accretion (2,800) (289)
Accumulated fixed interest expense accrual 1,698 2,419
Accumulated variable interest expense accrual 6,085 5,195
Repayment (1,272) (7,114)
Liabilities arising from financing activities at end of period 42,583 38,872
Bpifrance advance | Conditional Advances and Loans from Government and Public Authorities    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities at beginning of period 2,066 2,316
Principal received 0 0
Impact of discounting and accretion 12 16
Accumulated fixed interest expense accrual 28 34
Accumulated variable interest expense accrual 0 0
Repayment (500) (300)
Liabilities arising from financing activities at end of period 1,606 2,066
Interest-free Bpifrance loan | Conditional Advances and Loans from Government and Public Authorities    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities at beginning of period 0 125
Principal received 0 0
Impact of discounting and accretion 0 0
Accumulated fixed interest expense accrual 0 0
Accumulated variable interest expense accrual 0 0
Repayment 0 (125)
Liabilities arising from financing activities at end of period 0 0
EIB Loan    
Changes in liabilities arising from financing activities [abstract]    
Impact of discounting and accretion (2,800) 300
EIB Loan | Conditional Advances and Loans from Government and Public Authorities    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities at beginning of period 36,409 35,754
Principal received 0 0
Impact of discounting and accretion (2,832) (285)
Accumulated fixed interest expense accrual 1,670 2,385
Accumulated variable interest expense accrual 6,085 5,195
Repayment (697) (6,639)
Liabilities arising from financing activities at end of period 40,635 36,409
Curadigm Bpifrance advance | Conditional Advances and Loans from Government and Public Authorities    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities at beginning of period 397 317
Principal received 0 150
Impact of discounting and accretion 20 (20)
Accumulated fixed interest expense accrual 0 0
Accumulated variable interest expense accrual 0 0
Repayment (75) (50)
Liabilities arising from financing activities at end of period € 342 € 397