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Related Party Disclosures - Additional Information (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2019
shares
Dec. 31, 2020
EUR (€)
Disclosure Of Transactions Between Related Parties [Line Items]    
Outstanding balances of related party transaction   € 0
Bad debt expense has been recognized   € 0
Co-founder and Chief Executive Officer | Ordinary Shares    
Disclosure Of Transactions Between Related Parties [Line Items]    
Granted shares | shares 4,374,963