Name:	ifrs-full_DisclosureOfClassesOfShareCapitalLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of residual interest in the assets of the entity after deducting all its liabilities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The number of shares issued by the entity, for which full payment has been received.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

Number of shares issued during the period.

No definition available.

Name:	ncna_NumberOfSharesIssuedDuringThePeriod
Namespace Prefix:	ncna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Share capital subdivision and reclassification of share capital.

No definition available.

Name:	ncna_ShareCapitalSubdivisionAndReclassificationOfShareCapital
Namespace Prefix:	ncna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Share issuance costs.

No definition available.

Name:	ncna_ShareIssuanceCosts
Namespace Prefix:	ncna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Value of share capital subdivision and reclassification of share capital.

No definition available.

Name:	ncna_ValueOfShareCapitalSubdivisionAndReclassificationOfShareCapital
Namespace Prefix:	ncna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Value of shares issued during the period.

No definition available.

Name:	ncna_ValueOfSharesIssuedDuringThePeriod
Namespace Prefix:	ncna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	ifrs-full_ComponentsOfEquityAxis=ncna_OrdinaryShareCapitalMember
Namespace Prefix:
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Balance Type:
Period Type:

Name:	ifrs-full_ComponentsOfEquityAxis=ncna_DeferredShareCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_SharePremiumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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Namespace Prefix:
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