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Financial liabilities - Disclosure of reconciliation of liabilities arising from financing activities (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities at beginning of period € 109,218 € 74,466 € 49,231
Proceeds 0 47,444 58,119
Repayments (59,532) (13,167) (38,993)
Interest paid (6,491) (7,696) (5,278)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   (3,204) (1,046)
Non-cash changes: (gain)/loss on recognition or derecognition 2,281 (590) 3,027
Non-cash changes: interest expense and other 17,200 15,834 7,459
Non-cash changes: recognition of earn-out liability     (1,005)
Non-cash changes: amortized cost remeasurement 11,278 (3,404) 5,878
Non-cash changes: other fair value remeasurement 36,002 1,367 (3,198)
Non-cash changes : subsidies   (4,070)  
Non-cash changes: conversion into shares (78,275)    
Non cash changes: additional leases 444 2,221 272
Non cash changes : Effect of the change in foreign currency exchange rates (33) 17  
Liabilities arising from financing activities at end of period 32,093 109,218 74,466
Kreos 1 & 2 bond loans      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities at beginning of period 0 0 12,982
Proceeds 0 0 0
Repayments 0 0 (11,635)
Interest paid 0 0 (2,278)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   0 0
Non-cash changes: (gain)/loss on recognition or derecognition 0 0 170
Non-cash changes: interest expense and other 0 0 760
Non-cash changes: recognition of earn-out liability     0
Non-cash changes: amortized cost remeasurement 0 0 0
Non-cash changes: other fair value remeasurement 0 0 0
Non-cash changes : subsidies   0  
Non-cash changes: conversion into shares 0    
Non cash changes: additional leases 0 0 0
Non cash changes : Effect of the change in foreign currency exchange rates 0 0  
Liabilities arising from financing activities at end of period 0 0 0
OCEANE      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities at beginning of period 0 0 19,957
Proceeds 0 0 0
Repayments 0 0 (23,238)
Interest paid 0 0 (1,602)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   0 0
Non-cash changes: (gain)/loss on recognition or derecognition 0 0 3,069
Non-cash changes: interest expense and other 0 0 1,814
Non-cash changes: recognition of earn-out liability     0
Non-cash changes: amortized cost remeasurement 0 0 0
Non-cash changes: other fair value remeasurement 0 0 0
Non-cash changes : subsidies   0  
Non-cash changes: conversion into shares 0    
Non cash changes: additional leases 0 0 0
Non cash changes : Effect of the change in foreign currency exchange rates 0 0  
Liabilities arising from financing activities at end of period 0 0 0
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 0
Proceeds 0 0 23,119
Repayments 0 0 0
Interest paid (1,875) (2,250) (818)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   0 (1,046)
Non-cash changes: (gain)/loss on recognition or derecognition 0 0 0
Non-cash changes: interest expense and other 2,860 3,977 1,393
Non-cash changes: recognition of earn-out liability     (1,005)
Non-cash changes: amortized cost remeasurement 0 0 0
Non-cash changes: other fair value remeasurement 0 0 0
Non-cash changes : subsidies   0  
Non-cash changes: conversion into shares (24,354)    
Non cash changes: additional leases 0 0 0
Non cash changes : Effect of the change in foreign currency exchange rates 0 0  
Liabilities arising from financing activities at end of period 0 23,370 21,643
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 0 0
Proceeds 0 47,444 0
Repayments (53,920) 0 0
Interest paid (3,791) (3,639) 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   (3,204) 0
Non-cash changes: (gain)/loss on recognition or derecognition 3,838 0 0
Non-cash changes: interest expense and other 7,472 5,800 0
Non-cash changes: recognition of earn-out liability     0
Non-cash changes: amortized cost remeasurement 0 0 0
Non-cash changes: other fair value remeasurement 0 0 0
Non-cash changes : subsidies   0  
Non-cash changes: conversion into shares 0    
Non cash changes: additional leases 0 0 0
Non cash changes : Effect of the change in foreign currency exchange rates 0 0  
Liabilities arising from financing activities at end of period 0 46,401 0
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 0
Proceeds 0 0 35,000
Repayments (2,188) (8,750) (2,188)
Interest paid (689) (1,772) (525)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   0 0
Non-cash changes: (gain)/loss on recognition or derecognition (1,557) (590) (212)
Non-cash changes: interest expense and other 778 1,714 727
Non-cash changes: recognition of earn-out liability     0
Non-cash changes: amortized cost remeasurement 0 0 0
Non-cash changes: other fair value remeasurement 36,002 1,367 (3,198)
Non-cash changes : subsidies   0  
Non-cash changes: conversion into shares (53,921)    
Non cash changes: additional leases 0 0 0
Non cash changes : Effect of the change in foreign currency exchange rates 0 0  
Liabilities arising from financing activities at end of period 0 21,574 29,605
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 4,838
Proceeds 0 0 0
Repayments (2,514) (1,250) (1,250)
Interest paid (72) (18) (43)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   0 0
Non-cash changes: (gain)/loss on recognition or derecognition 0 0 0
Non-cash changes: interest expense and other 99 77 133
Non-cash changes: recognition of earn-out liability     0
Non-cash changes: amortized cost remeasurement 0 0 0
Non-cash changes: other fair value remeasurement 0 0 0
Non-cash changes : subsidies   0  
Non-cash changes: conversion into shares 0    
Non cash changes: additional leases 0 0 0
Non cash changes : Effect of the change in foreign currency exchange rates 0 0  
Liabilities arising from financing activities at end of period 0 2,488 3,678
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 6,783
Proceeds 0 0 0
Repayments 0 (2,708) (110)
Interest paid 0 0 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   0 0
Non-cash changes: (gain)/loss on recognition or derecognition 0 0 0
Non-cash changes: interest expense and other 0 7 98
Non-cash changes: recognition of earn-out liability     0
Non-cash changes: amortized cost remeasurement 0 0 0
Non-cash changes: other fair value remeasurement 0 0 0
Non-cash changes : subsidies   (4,070)  
Non-cash changes: conversion into shares 0    
Non cash changes: additional leases 0 0 0
Non cash changes : Effect of the change in foreign currency exchange rates 0 0  
Liabilities arising from financing activities at end of period 0 0 6,771
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 1,384
Proceeds 0 0 0
Repayments (910) (459) (573)
Interest paid (64) (17) (12)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   0 0
Non-cash changes: (gain)/loss on recognition or derecognition 0 0 0
Non-cash changes: interest expense and other 64 61 12
Non-cash changes: recognition of earn-out liability     0
Non-cash changes: amortized cost remeasurement (7) 0 (543)
Non-cash changes: other fair value remeasurement 0 0 0
Non-cash changes : subsidies   0  
Non-cash changes: conversion into shares 0    
Non cash changes: additional leases 444 2,221 272
Non cash changes : Effect of the change in foreign currency exchange rates (33) 17  
Liabilities arising from financing activities at end of period 1,856 2,363 540
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 3,287
Proceeds 0 0 0
Repayments 0 0 0
Interest paid 0 0 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments   0 0
Non-cash changes: (gain)/loss on recognition or derecognition 0 0 0
Non-cash changes: interest expense and other 5,927 4,198 2,521
Non-cash changes: recognition of earn-out liability     0
Non-cash changes: amortized cost remeasurement 11,286 (3,404) 6,421
Non-cash changes: other fair value remeasurement 0 0 0
Non-cash changes : subsidies   0  
Non-cash changes: conversion into shares 0    
Non cash changes: additional leases 0 0 0
Non cash changes : Effect of the change in foreign currency exchange rates 0 0  
Liabilities arising from financing activities at end of period € 30,237 € 13,023 € 12,229