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Employees and Employee-Related Costs - Number of employees (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number and average number of employees [abstract] |  |  |
Average number of full-time employees | 33 | 25 | 18
Number of employees, including consultants, by country at end of period: | 35 | 31 | 20
Denmark and United States |  |  |
Number and average number of employees [abstract] |  |  |
Number of employees, including consultants, by country at end of period: | 35 | 31 | 20

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- Definition Number of employees and consultants. + References No definition available. + Details
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Namespace Prefix: | evax_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition The average number of personnel employed by the entity during a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |