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v3.20.4

Contract Liability and Receivable - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 year
Disclosure of revenue from contracts with customers [Abstract] |
Expected recognition period | 5

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- Definition Contract Liability, Recognition Period + References No definition available. + Details
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Namespace Prefix: | oncyf_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of revenue from contracts with customers [Abstract] + References No definition available. + Details
Name: | oncyf_DisclosureofrevenuefromcontractswithcustomersAbstract
Namespace Prefix: | oncyf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration