v3.25.2
Financial liabilities - Disclosure of reconciliation of liabilities arising from financing activities (Details) - EUR (€)
€ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period € 109,218 € 74,466
Proceeds   47,444
Repayments (13,032) (6,033)
Interest paid (3,868) (2,949)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   (3,204)
Non-cash changes: (gain)/loss on recognition or derecognition (295) (295)
Non-cash changes: interest expense and other 8,056 6,232
Non-cash changes: other fair value remeasurement (1,339) (91)
Non-cash changes : subsidies   (4,070)
Non-cash changes : other reclassifications   (173)
Non cash changes: additional leases   2,036
Non cash changes : Effect of the change in foreign currency exchange rates (32)  
Liabilities arising from financing activities at end of period 98,709 113,363
Kreos & Claret convertible notes (OCABSA)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 23,370 21,643
Proceeds  
Repayments
Interest paid (1,125) (1,125)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments  
Non-cash changes: (gain)/loss on recognition or derecognition
Non-cash changes: interest expense and other 2,048 1,948
Non-cash changes: other fair value remeasurement
Non-cash changes : subsidies  
Non-cash changes : other reclassifications  
Non cash changes: additional leases  
Non cash changes : Effect of the change in foreign currency exchange rates  
Liabilities arising from financing activities at end of period 24,293 22,466
Kreos & Claret bond loans    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 46,401
Proceeds   47,444
Repayments (9,140)
Interest paid (1,974) (829)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   (3,204)
Non-cash changes: (gain)/loss on recognition or derecognition
Non-cash changes: interest expense and other 4,136 1,365
Non-cash changes: other fair value remeasurement
Non-cash changes : subsidies  
Non-cash changes : other reclassifications  
Non cash changes: additional leases  
Non cash changes : Effect of the change in foreign currency exchange rates  
Liabilities arising from financing activities at end of period 39,423 44,776
Heights convertible notes    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 21,574 29,605
Proceeds   0
Repayments (2,188) (4,375)
Interest paid (689) (952)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments  
Non-cash changes: (gain)/loss on recognition or derecognition (295) (295)
Non-cash changes: interest expense and other 680 920
Non-cash changes: other fair value remeasurement (1,339) (91)
Non-cash changes : subsidies  
Non-cash changes : other reclassifications  
Non cash changes: additional leases  
Non cash changes : Effect of the change in foreign currency exchange rates  
Liabilities arising from financing activities at end of period 17,743 24,812
PGE    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 2,488 3,678
Proceeds  
Repayments (1,250) (1,250)
Interest paid (43) (18)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments  
Non-cash changes: (gain)/loss on recognition or derecognition
Non-cash changes: interest expense and other 44 34
Non-cash changes: other fair value remeasurement
Non-cash changes : subsidies  
Non-cash changes : other reclassifications  
Non cash changes: additional leases  
Non cash changes : Effect of the change in foreign currency exchange rates  
Liabilities arising from financing activities at end of period 1,238 2,444
Conditional advances Bpifrance    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 0 6,771
Proceeds  
Repayments (55)
Interest paid
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments  
Non-cash changes: (gain)/loss on recognition or derecognition
Non-cash changes: interest expense and other 7
Non-cash changes: other fair value remeasurement
Non-cash changes : subsidies   (4,070)
Non-cash changes : other reclassifications   (173)
Non cash changes: additional leases  
Non cash changes : Effect of the change in foreign currency exchange rates  
Liabilities arising from financing activities at end of period 0 2,480
Lease liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 2,363 540
Proceeds  
Repayments (454) (353)
Interest paid (36) (25)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments  
Non-cash changes: (gain)/loss on recognition or derecognition
Non-cash changes: interest expense and other 36 25
Non-cash changes: other fair value remeasurement
Non-cash changes : subsidies   0
Non-cash changes : other reclassifications  
Non cash changes: additional leases   2,036
Non cash changes : Effect of the change in foreign currency exchange rates (32)  
Liabilities arising from financing activities at end of period 1,876 2,223
Royalty certificates    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 13,023 12,229
Proceeds  
Repayments
Interest paid
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments  
Non-cash changes: (gain)/loss on recognition or derecognition
Non-cash changes: interest expense and other 1,112 1,933
Non-cash changes: other fair value remeasurement
Non-cash changes : subsidies   0
Non-cash changes : other reclassifications  
Non cash changes: additional leases  
Non cash changes : Effect of the change in foreign currency exchange rates  
Liabilities arising from financing activities at end of period € 14,135 € 14,162