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Cash and cash equivalents (Details) - EUR (€)
€ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]            
Cash € 147,149   € 52,729      
Short-term deposits     117,292      
Total cash and cash equivalents 147,149 € 174,326 170,021 € 227,073 € 271,396 € 100,635
Expected credit loss, cash and cash equivalents € 223   € 0