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Intangible assets - Schedule of Intangible Assets (Details)
€ in Thousands
 6 Months Ended
Jun. 30, 2025
EUR (€)
Disclosure of detailed information about intangible assets  
Intangible assets at beginning of period € 7
Increases 6
Decreases 0
Transfer 0
Intangible assets at end of period 13
Gross book value of intangible assets  
Disclosure of detailed information about intangible assets  
Intangible assets at beginning of period 734
Increases 8
Decreases 0
Transfer 0
Intangible assets at end of period 742
Gross book value of intangible assets | Patents  
Disclosure of detailed information about intangible assets  
Intangible assets at beginning of period 65
Increases 7
Decreases 0
Transfer 0
Intangible assets at end of period 72
Gross book value of intangible assets | Software  
Disclosure of detailed information about intangible assets  
Intangible assets at beginning of period 669
Increases 1
Decreases 0
Transfer 0
Intangible assets at end of period 669
Accumulated depreciation of intangible assets  
Disclosure of detailed information about intangible assets  
Intangible assets at beginning of period (727)
Increases (2)
Decreases 0
Transfer 0
Intangible assets at end of period (729)
Accumulated depreciation of intangible assets | Patents  
Disclosure of detailed information about intangible assets  
Intangible assets at beginning of period (65)
Increases 0
Decreases 0
Transfer 0
Intangible assets at end of period (65)
Accumulated depreciation of intangible assets | Software  
Disclosure of detailed information about intangible assets  
Intangible assets at beginning of period (662)
Increases (2)
Decreases 0
Transfer 0
Intangible assets at end of period € (663)