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Non-current financial assets - Disclosure of Changes in Non-current Financial Assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets [line items]    
Non-current financial assets at beginning of period € 505 € 529
Additions 9 9
Decreases (6) (31)
Transfer 8  
Currency translation adjustments 3 (2)
Non-current financial assets at end of period 519 505
Liquidity contract - Cash account | Financial assets at fair value, class    
Disclosure of financial assets [line items]    
Non-current financial assets at beginning of period 105 131
Additions 0 0
Decreases (6) (27)
Transfer 0  
Currency translation adjustments 0 0
Non-current financial assets at end of period 98 105
Other long-term investments pledged as collateral | Financial assets at amortised cost, class    
Disclosure of financial assets [line items]    
Non-current financial assets at beginning of period 0 0
Additions 0 0
Decreases 0 0
Transfer 0  
Currency translation adjustments 0 0
Non-current financial assets at end of period 0 0
Security deposits paid | Financial assets at amortised cost, class    
Disclosure of financial assets [line items]    
Non-current financial assets at beginning of period 401 399
Additions 9 9
Decreases 0 (5)
Transfer 8  
Currency translation adjustments 3 (2)
Non-current financial assets at end of period € 421 € 401