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Debt - Debt and borrowings (Details)
€ in Thousands
1 Months Ended 12 Months Ended
May 31, 2020
EUR (€)
loan
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Jan. 01, 2019
EUR (€)
Disclosure of detailed information about borrowings [line items]          
Bank borrowings   € 9,984 € 9,992 € 74  
Other loans and similar borrowings   6 62 3  
Lease liabilities   130 2 37  
Total debt   10,119 10,055 114 € 392
Increase (Decrease) in borrowings     9,900    
Loan obtained     9,979    
Payments of lease liabilities, classified as financing activities   € 15 € 26 130  
Repayments of borrowings       € 100  
Financing from a syndicate of French banks          
Disclosure of detailed information about borrowings [line items]          
Number of loans obtained | loan 3        
Loan obtained € 10,000        
Extension of term of debt 4 years 4 years      
Socit Gnrale          
Disclosure of detailed information about borrowings [line items]          
Total debt   € 13