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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

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