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Income and Expenses - Sales and Marketing Expenses (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Income And Expenses [Line Items]      
Sales and marketing expenses € 14,512 € 2,718 € 3,041
Wages, Benefits and Social Security Expense      
Disclosure Of Income And Expenses [Line Items]      
Sales and marketing expenses 1,636 1,938 1,728
Purchased Services      
Disclosure Of Income And Expenses [Line Items]      
Sales and marketing expenses 10,929 247 794
Other      
Disclosure Of Income And Expenses [Line Items]      
Sales and marketing expenses € 1,947 € 533 € 519