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Trade receivables and other current assets - Disclosure of Break Down of Trade Receivables (Details) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Trade receivables € 0 € 62
Due in 3 months or less    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Trade receivables 0 62
Due between 3 and 6 months    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Trade receivables 0 0
Due between 6 and 12 months    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Trade receivables 0 0
Due after more than 12 months    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Trade receivables € 0 € 0