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Critical accounting judgment and key sources of estimation and uncertainty (Details)
€ in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2022
EUR (€)
Sep. 30, 2022
EUR (€)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Disclosure of detailed information about borrowings [line items]            
Income from revaluation of derivative financial instruments       € 516 € 752 € 93
Write down of derivative financial instrument       2,827   € 808
European Investment Bank            
Disclosure of detailed information about borrowings [line items]            
Income from revaluation of derivative financial instruments       516    
Write down of derivative financial instrument       2,827    
EIB-Tranche A            
Disclosure of detailed information about borrowings [line items]            
Income from revaluation of derivative financial instruments         460  
Write down of derivative financial instrument € 2,800 € 4,700 $ 4,664 2,827    
EIB-Tranche B1            
Disclosure of detailed information about borrowings [line items]            
Income from revaluation of derivative financial instruments € 500     € 516 € 292  
Write down of derivative financial instrument   € 900 $ 907