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Segment information - Additional information (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Jun. 30, 2022
Dec. 31, 2021
Jan. 01, 2021
Segment information and revenue from contracts with customers        
Real estate transfer tax expenses € 1,200      
Property, plant and equipment*   € 7,217 € 9,464 € 16,590
Right-of-use assets   17,059 18,904 € 22,120
-United States        
Segment information and revenue from contracts with customers        
Property, plant and equipment*   115 147  
Right-of-use assets   € 0 € 137