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Additional Cash Flow Disclosures - Other Cash Flow Disclosures (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Additional Cash Flow Disclosures [Abstract]
Cash interest received	$ 1,339	$ 1,554	$ 452
Cash taxes paid	$ 184	$ 120	$ 46

X

- Definition

The cash flows from income taxes paid or refunded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 35
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_IncomeTaxesPaidRefund
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Additional Cash Flow Disclosures

+ References

No definition available.

+ Details

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

X

- Definition

Proceeds from Interest Received

+ References

No definition available.

+ Details

Name:	oncyf_ProceedsfromInterestReceived
Namespace Prefix:	oncyf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration