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Intangible assets - Paragraph (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020
DisclosureOfIntangibleAssetsLineItems
Additional accrual related license agreement		$ 60,000
Technology-based intangible assets [member]
DisclosureOfIntangibleAssetsLineItems
License agreement on milestone payment	$ 35,000
Additional option to extend agreement term	10 years
Capitalized intangible assets		35,000
Additional consideration	$ 320,000
Amount to be transferred upon each regulatory approval of a product	$ 250,000
Technology-based intangible assets [member] | SSI
DisclosureOfIntangibleAssetsLineItems
Capitalized intangible assets		$ 60,000

X

- Definition

Additional amount accrued related to license agreement.

+ References

No definition available.

+ Details

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X

- Definition

The additional extension period of license agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

The maximum amount of additional consideration payable subject to meeting certain development milestones in license agreement.

+ References

No definition available.

+ Details

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X

- Definition

The amount of milestone payment upon execution of license agreement.

+ References

No definition available.

+ Details

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X

- Definition

The amount of consideration payable upon each regulatory approval of a product utilizing the in-licensed technology.

+ References

No definition available.

+ Details

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Namespace Prefix:	evax_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph e
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard
-URIDate 2020-01-01

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- 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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- Details

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- Details

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