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Basis of preparation (Details)
€ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
EUR (€)
shares
Mar. 31, 2021
EUR (€)
Dec. 31, 2021
EUR (€)
Mar. 31, 2022
$ / shares
Jan. 31, 2022
$ / shares
shares
Disclosure of changes in accounting estimates [line items]          
Number of securities called by warrants | shares 1       1,343,727
Exercise price of warrants | $ / shares       $ 7.72 $ 7.72
Property, plant and equipment € 7,674   € 9,464    
Other operating income 733 € 366 3,209    
Change          
Disclosure of changes in accounting estimates [line items]          
Depreciation expense     (1,317)    
Other operating income (expense)     273    
Lease liability     (273)    
Property, plant and equipment     1,317    
Other operating income     € 273    
Warrants          
Disclosure of changes in accounting estimates [line items]          
Share issue related cost € 68