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

X

- 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

X

- References

No definition available.

+ Details

Name:	evax_SummaryOfSignificantAccountingPoliciesAbstract
Namespace Prefix:	evax_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration