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Other Reserves - Additional Information (Details) | Dec. 31, 2017 shares
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Disclosure Of Other Reserves [Abstract] |
Number of shares purchased by employee benefit trust under share options plan | 500,000

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- 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 2017-01-01 -Paragraph 79 -Subparagraph a -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_vii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- 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