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Summary of Significant Accounting Policies - Deferred offering costs (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Summary of Significant Accounting Policies |
Deferred offering costs | $ 1,729

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- Definition The amount of deferred offering costs. + References No definition available. + Details
Name: | evax_DeferredOfferingCost
Namespace Prefix: | evax_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | evax_SummaryOfSignificantAccountingPoliciesAbstract
Namespace Prefix: | evax_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration