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Significant accounting policies (Details) - EUR (€)
€ in Thousands
12 Months Ended
Jan. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Disclosure of detailed information about accounting policy adoption            
Accumulated losses     € (297,779) € (211,441) € (112,272)  
Increase in deferred income     83,200      
Cumulative fair value loss recognized in other comprehensive income       (600) (400)  
Operating result     (44,807) (89,802) (11,491)  
Cash flow from operating activities     (142,466) (147,030) 239,403  
Cash flows from financing activities     287,876 353,357 € 395,996  
IFRS 16            
Disclosure of detailed information about accounting policy adoption            
Right-of-use assets           € 26,300
Lease liabilities           € 26,300
Depreciation charges and interest cost   € 5,300        
Operating result   200        
Finance costs   400        
Cash flow from operating activities   4,900        
Cash flows from financing activities   € (4,900)        
IFRS 15            
Disclosure of detailed information about accounting policy adoption            
Accumulated losses € (83,200)          
Increase in deferred income     € 83,200      
IFRS 9            
Disclosure of detailed information about accounting policy adoption            
Fair value loss reclassified to accumulated losses € 600          
IAS 39            
Disclosure of detailed information about accounting policy adoption            
Cumulative fair value loss recognized in other comprehensive income       € 600