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Additional Cash Flow Disclosures - Other Cash Flow Disclosures (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of cash flows [abstract] |  |  |
Cash interest received | $ 189,720 | $ 274,094 | $ 173,496
Cash taxes paid | $ 12,080 | $ 5,448 | $ 15,728

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- 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 2020-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35&doctype=Standard -URIDate 2020-01-01 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration

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- Definition Proceeds from Interest Received + References No definition available. + Details
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Namespace Prefix: | oncyf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration