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Commitments and Contingencies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 CAD ($)
Contingencies [Abstract] |
Commitment for payment | $ 12,686
Commitment term | 3 years
Lease not yet commenced, payments | $ 1,098
Lease not yet commenced, term | 5 years 3 months 18 days

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- Definition Contingencies [Abstract] + References No definition available. + Details
Name: | oncyf_ContingenciesAbstract
Namespace Prefix: | oncyf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease Not Yet Commenced, Payments + References No definition available. + Details
Name: | oncyf_LeaseNotYetCommencedPayments
Namespace Prefix: | oncyf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lease Not Yet Commenced, Term + References No definition available. + Details
Name: | oncyf_LeaseNotYetCommencedTerm
Namespace Prefix: | oncyf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Purchase Obligation1 + References No definition available. + Details
Name: | oncyf_PurchaseObligation1
Namespace Prefix: | oncyf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Purchase Obligation, Commitment Term + References No definition available. + Details
Name: | oncyf_PurchaseObligationCommitmentTerm
Namespace Prefix: | oncyf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration