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Income Tax - Summary of Deferred Tax Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statements [Line Items]    
Deferred tax assets € 0 € 0
Deferred tax liabilities 0 0
Non-recognition due to history of losses (2,016) (3,075)
Deferred tax assets netting (1,713) (854)
Deferred tax liabilities netting 1,713 854
Intangible assets [Member]    
Statements [Line Items]    
Deferred tax assets 1,770 2,064
Deferred revenue [Member]    
Statements [Line Items]    
Deferred tax assets 180 358
Lease liability [Member]    
Statements [Line Items]    
Deferred tax assets 1,776 886
Deferred expenses [Member]    
Statements [Line Items]    
Deferred tax assets 3 14
Recognized [Member]    
Statements [Line Items]    
Deferred tax assets 3,729 3,929
Right-of-use asset [Member]    
Statements [Line Items]    
Deferred tax liabilities 1,713 854
Recognized [Member]    
Statements [Line Items]    
Deferred tax liabilities € 1,713 854
Other liabilities [Member]    
Statements [Line Items]    
Deferred tax assets   € 607