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Cash Equivalents (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash equivalents [abstract]
Cash equivalents	$ 39,901,509	$ 30,361,591
Current annual interest rate	0.45%	0.36%

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- Definition

The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard
-URIDate 2021-03-24

+ Details

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Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Cash Equivalents, Interest Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	oncyf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration