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Financial liabilities - Disclosure of changes in derivative instruments (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period € 2,579 € 566 € 9,932
Issuance 2,158 3,585  
Increase in fair value 1,462 3,046 0
Decrease in fair value (1,413) (1,006) (9,366)
Repurchases   (2,591)  
Exercises   (1,021)  
Derivative financial liabilities at end of period 4,786 2,579 566
Kreos A BSA      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 0 275 2,478
Issuance 0 0  
Increase in fair value 0 986 0
Decrease in fair value 0 0 (2,203)
Repurchases   (489)  
Exercises   (771)  
Derivative financial liabilities at end of period 0 0 275
Kreos B BSA      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 0 149 1,525
Issuance 0 0  
Increase in fair value 0 440 0
Decrease in fair value 0 0 (1,376)
Repurchases   (339)  
Exercises   (250)  
Derivative financial liabilities at end of period 0 0 149
OCEANE conversion option      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 0 142 5,929
Issuance 0 0  
Increase in fair value 0 1,620 0
Decrease in fair value 0 0 (5,787)
Repurchases   (1,762)  
Exercises   0  
Derivative financial liabilities at end of period 0 0 142
Kreos/Claret BSA      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 2,579 0 0
Issuance 0 3,585  
Increase in fair value 0 0 0
Decrease in fair value (1,413) (1,006) 0
Repurchases   0  
Exercises   0  
Derivative financial liabilities at end of period 1,166 2,579 0
Kreos/Claret Minimum Return Indemnifications      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 0 0 0
Issuance 2,158 0  
Increase in fair value 1,462 0 0
Decrease in fair value 0 0 0
Repurchases   0  
Exercises   0  
Derivative financial liabilities at end of period € 3,620 € 0 € 0