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Other current and non-current assets - Additional Information (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]    
Prepaid insurance expenses € 1,000 € 100
Prepaid expenses of licenses and software 600 200
Other assets 787 617
Non-current prepayments 724 937
Receivables From Capital Gains Tax [Member]    
Disclosure of subsidiaries [line items]    
Other assets 400 300
Celgene Switzerland LLC And Genmab AS [Member]    
Disclosure of subsidiaries [line items]    
Current Incremental cost for collaboration agreement 500 600
Non-current prepayments € 700 € 900