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Leases - Summary of Amounts Recognized in Statements of Operations With Respect to Lease Contracts (Detail) - GBP (£) £ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Presentation Of Leases For Lessee [Abstract] |  |  |
Depreciation expense of right of use assets under IFRS 16 | £ 268 | £ 193 |
Accretion of interest | 26 | 21 |
Operating lease expense under IAS 17 |  |  | £ 150
Total amount recognized in statements of operations | £ 294 | £ 214 | £ 150

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | na
Period Type: | duration

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- Definition The gains (losses) arising from sale and leaseback transactions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_i&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
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- Definition Operating lease expenses. + References No definition available. + Details
Name: | ncna_OperatingLeaseExpenses
Namespace Prefix: | ncna_
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Balance Type: | debit
Period Type: | duration