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Summary of Significant Accounting Policies - Accounting for joint operation (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 04, 2021 | Dec. 31, 2020 USD ($) agreement | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure of joint operations [line items] |  |  |  |
Number of collaborative agreement | agreement |  | 1 |  |
Stock split on bonus issue of shares | 2 |  |  |
Stock split from ordinary shares | 17 |  |  |
Southern Denmark University collaboration agreement |  |  |  |
Disclosure of joint operations [line items] |  |  |  |
Compensation cost | $ |  | $ 0.3 | $ 0.3 | $ 0.0

X
- Definition Compensation expense paid to joint operation + References No definition available. + Details
Name: | evax_CompensationExpense
Namespace Prefix: | evax_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of collaboration agreement. + References No definition available. + Details
Name: | evax_NumberOfCollaborationAgreement
Namespace Prefix: | evax_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Stock split ratio of issued and outstanding ordinary shares. + References No definition available. + Details
Name: | evax_StockSplitFromOrdinaryShares
Namespace Prefix: | evax_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio applied to the conversion on bonus issue of shares. + References No definition available. + Details
Name: | evax_StockSplitOnBonusIssueOfShares
Namespace Prefix: | evax_
Data Type: | xbrli:pureItemType
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
Name: | ifrs-full_DisclosureOfJointOperationsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_JointOperationsAxis=evax_SouthernDenmarkUniversityCollaborationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |