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Other Information - Balances and transactions with related parties (Details) - EUR (€)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
MLLNNL LLC      
Disclosure of transactions between related parties [line items]      
Professional fees expense € 149,000 € 187,000  
Affinitas and rocket internet se agreement | Affinitas GmbH      
Disclosure of transactions between related parties [line items]      
Amounts payable, related party transactions     € 0