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Segment information - Additional information (Details) - EUR (€)
€ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Segment information      
Property, plant and equipment € 8,709   € 8,376
Right-of-use assets 24,710   24,932
-United States      
Segment information      
Property, plant and equipment 276   286
Right-of-use assets 960   € 1,042
Corporate      
Segment information      
Share issue related cost € 0 € 109