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Comparative Figures	12 Months Ended
	Dec. 31, 2020
Comparative figures [Abstract]
Comparative Figures	Comparative FiguresReclassification was made to prior period's figure to conform to the current period's presentation.

X

- Definition

The disclosure, in the entity's first IFRS financial statements, of comparative information prepared under previous GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 1
-IssueDate 2020-01-01
-Paragraph 24
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_24&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_DisclosureOfComparativeInformationPreparedUnderPreviousGAAPExplanatory
Namespace Prefix:	ifrs-full_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Comparative figures [Abstract]

+ References

No definition available.

+ Details

Name:	oncyf_ComparativeFiguresAbstract
Namespace Prefix:	oncyf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration