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Financial Risk Management Objectives and Policies - Additional Information (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
[2]
Dec. 31, 2017
Statements [Line Items]        
Cash and cash equivalents € 207,530 € 103,353 [1] € 39,367 € 8,415
Credit risk [member]        
Statements [Line Items]        
Maximum exposure to credit risk 232,000 119,000    
Cash and cash equivalents 208,000 103,000    
Other financial assets 24,000 € 16,000    
Currency risk [member] | Top of range [member]        
Statements [Line Items]        
Foreign exchange gain (loss) 10,900      
Currency risk [member] | Bottom of range [member]        
Statements [Line Items]        
Foreign exchange gain (loss) € 13,200      
Currency risk [member] | Euro [Member]        
Statements [Line Items]        
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk 10.00%      
Currency risk [member] | US [Member]        
Statements [Line Items]        
Percentage Of Reasonably Possible Increase In Foreign Currency Risk 10.00%      
[1] See Note 2 for details regarding the change in presentation of Other financial assets
[2] See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets