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v3.21.1

Share-Based Payments - Amendments to Warrants (Details) - Warrants - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-Based Payments |  |
Vesting period |  | 3 years
Reduction in share based compensation expense due to change in accounting estimate | $ 0.4 |

X
- Definition Amount of share based compensation expense due to change in accounting estimate. + References No definition available. + Details
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Namespace Prefix: | evax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Vesting period of share options granted. + References No definition available. + Details
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Namespace Prefix: | evax_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=evax_IfrsWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |