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Intangible assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning of period € 21 € 163
Increases (17) (141)
Decreases 0 0
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period 4 21
Gross book value of intangible assets    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning of period 717 710
Increases 5 11
Decreases 0 (5)
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period 722 717
Gross book value of intangible assets | Patents    
Disclosure of detailed information about intangible assets [line items]    
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    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning of period 651 584
Increases 5 11
Decreases 0 (5)
Transfer 0 61
Currency translation 0 0
Intangible assets at end of period 657 651
Gross book value of intangible assets | Intangible assets in progress    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning of period 0 61
Increases 0 0
Decreases 0 0
Transfer 0 (61)
Currency translation 0 0
Intangible assets at end of period 0 0
Accumulated depreciation of intangible assets    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning of period (695) (548)
Increases (22) (152)
Decreases 0 5
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period (717) (695)
Accumulated depreciation of intangible assets | Patents    
Disclosure of detailed information about intangible assets [line items]    
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    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning of period (630) (483)
Increases (22) (152)
Decreases 0 5
Transfer 0 0
Currency translation 0 0
Intangible assets at end of period € (652) € (630)