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Share-Based Payments - Amendments to Warrants (Details) - Warrants - USD ($) $ in Millions	12 Months Ended
	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
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: