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Revenue - AbbVie Collaboration Agreement (Details) kr in Millions, $ in Millions |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 10, 2020 DKK (kr) item | Jul. 31, 2020 DKK (kr) | Jul. 31, 2020 USD ($) | Jun. 30, 2021 DKK (kr) | Jun. 30, 2020 DKK (kr)
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Revenue |  |  |  | kr 3,553 | kr 6,343
License fees |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Revenue |  |  |  |  | 4,398
AbbVie |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Upfront payment |  | kr 4,911 | $ 750 |  |
Revenue |  |  |  | kr 245 | 4,398
Number of delivery license programs | item | 3 |  |  |  |
Performance obligation Revenue recognition period | 7 years |  |  |  |
AbbVie | Performance obligations satisfied over time |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Contract transaction price | kr 513 |  |  |  |
AbbVie | License fees |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Revenue |  |  |  |  | kr 4,398

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