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Other Reserves - Additional Information (Detail)	Dec. 31, 2020 shares
Disclosure Of Other Reserves [Abstract]
Number of shares purchased by employee benefit trust under share options plan	500,000

X

- Definition

The number of shares reserved for issue under options and contracts for the sale of shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 79
-Subparagraph a
-Clause vii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a_vii&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Disclosure of other reserves [abstract].

+ References

No definition available.

+ Details

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