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Share-Based Payments - Schedule of Expense Recognized for Employee Services Received (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Equity Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received € 1,015    
Management Board Grant      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 2,760    
Employee Stock Ownership Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 17,075 € 27,028 € 7,641
Cost of Sales | Employee Equity Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 179    
Cost of Sales | Employee Stock Ownership Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 869 896 114
Research and Development Expenses | Employee Equity Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 681    
Research and Development Expenses | Management Board Grant      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 1,514    
Research and Development Expenses | Employee Stock Ownership Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 11,120 20,016 6,786
Sales and Marketing Expenses | Employee Equity Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 8    
Sales and Marketing Expenses | Employee Stock Ownership Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 111 108 13
General And Administrative Expenses | Employee Equity Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 147    
General And Administrative Expenses | Management Board Grant      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received 1,246    
General And Administrative Expenses | Employee Stock Ownership Plan      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Expense recognized for employee services received € 4,975 € 6,008 € 728