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Intangible assets (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets at beginning of period € 8 € 1
Increases (2)  
Decreases 0 0
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period 7 8
Gross book value of intangible assets | Patents    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets at beginning of period 65 65
Increases 0 0
Decreases 0 0
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period 65 65
Gross book value of intangible assets | Software    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets at beginning of period 667 658
Increases 2 9
Decreases 0 0
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period 669 667
Gross book value of intangible assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets at beginning of period 732 723
Increases 2 9
Decreases 0 0
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period 734 732
Accumulated depreciation of intangible assets | Patents    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets at beginning of period (65) (65)
Increases 0 0
Decreases 0 0
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period (65) (65)
Accumulated depreciation of intangible assets | Software    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets at beginning of period (659) (657)
Increases (4) (2)
Decreases 0 0
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period (662) (659)
Accumulated depreciation of intangible assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets at beginning of period (724) (721)
Increases (4) (2)
Decreases 0 0
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period € (727) (724)
Netting    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Increases   € 7