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Deferred Expenses - Summary of Deferred Expenses (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Deferred Expenses [Abstract]    
Deferred expenses from insurance contracts € 13,845 € 1,758
Deferred expenses from CRO and CMO contracts 5,725  
Other 8,431 4,104
Total 28,001 5,862
Deferred expenses 28,001 5,862
Total non-current € 0 € 0