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Financial liabilities - Disclosure of changes in derivative instruments (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period € 4,786 € 2,579 € 566
Issuance   2,158 3,585
Increase in fair value 29,935 1,462 3,046
Decrease in fair value (3,620) (1,413) (1,006)
Repurchases (4,427)   (2,591)
Exercises (26,674)   (1,021)
Derivative financial liabilities at end of period 0 4,786 2,579
Kreos A BSA      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 0 0 275
Issuance   0 0
Increase in fair value 0 0 986
Decrease in fair value 0 0 0
Repurchases 0   (489)
Exercises 0   (771)
Derivative financial liabilities at end of period 0 0 0
Kreos B BSA      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 0 0 149
Issuance   0 0
Increase in fair value 0 0 440
Decrease in fair value 0 0 0
Repurchases 0   (339)
Exercises 0   (250)
Derivative financial liabilities at end of period 0 0 0
OCEANE conversion option      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 0 0 142
Issuance   0 0
Increase in fair value 0 0 1,620
Decrease in fair value 0 0 0
Repurchases 0   (1,762)
Exercises 0   0
Derivative financial liabilities at end of period 0 0 0
Kreos/Claret BSA      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 1,166 2,579 0
Issuance   0 3,585
Increase in fair value 29,935 0 0
Decrease in fair value 0 (1,413) (1,006)
Repurchases (4,427)   0
Exercises (26,674)   0
Derivative financial liabilities at end of period 0 1,166 2,579
Kreos/Claret Minimal Return Indemnifications      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities at beginning of period 3,620 0 0
Issuance   2,158 0
Increase in fair value 0 1,462 0
Decrease in fair value (3,620) 0 0
Repurchases 0   0
Exercises 0   0
Derivative financial liabilities at end of period € 0 € 3,620 € 0