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Intangible assets - Disclosure of reconciliation of intangible assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period € 6,606 € 6,604 € 6,607
Intangible assets other than goodwill at end of period 6,605 6,606 6,604
LICENSES      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period 75 75 75
Intangible assets other than goodwill at end of period 75 75 75
SOFTWARE      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period 3 0 3
Intangible assets other than goodwill at end of period 2 3 0
PATENTS      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period 6,529 6,529 6,529
Intangible assets other than goodwill at end of period 6,529 6,529 6,529
GROSS VALUES      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period 6,677 6,673 6,673
Acquisition   3  
Intangible assets other than goodwill at end of period 6,677 6,677 6,673
GROSS VALUES | LICENSES      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period 120 120 120
Acquisition   0  
Intangible assets other than goodwill at end of period 120 120 120
GROSS VALUES | SOFTWARE      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period 27 24 24
Acquisition   3  
Intangible assets other than goodwill at end of period 27 27 24
GROSS VALUES | PATENTS      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period 6,529 6,529 6,529
Acquisition   0  
Intangible assets other than goodwill at end of period 6,529 6,529 6,529
AMORTIZATION      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period (70) (70) (66)
Increase (1) (1) (3)
Intangible assets other than goodwill at end of period (71) (70) (70)
AMORTIZATION | LICENSES      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period (45) (45) (45)
Increase 0 0 0
Intangible assets other than goodwill at end of period (45) (45) (45)
AMORTIZATION | SOFTWARE      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period (25) (24) (21)
Increase (1) (1) (3)
Intangible assets other than goodwill at end of period (26) (25) (24)
AMORTIZATION | PATENTS      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets other than goodwill at beginning of period 0 0 0
Increase 0 0 0
Intangible assets other than goodwill at end of period € 0 € 0 € 0