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Events After the Reporting Period	12 Months Ended
	Dec. 31, 2020
Events After Reporting Period [Abstract]
Events After the Reporting Period	18. Events after the reporting period There have been no significant changes to the Company’s circumstances since the year end.

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- Definition

The entire disclosure for events after the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 10
-IssueDate 2020-01-01
-Section Disclosure
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=10&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=IAS10_g17-22_TI
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

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- Definition

Events after reporting period.

+ References

No definition available.

+ Details

Name:	ncna_EventsAfterReportingPeriodAbstract
Namespace Prefix:	ncna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration