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Staff Costs - Additional Information (Details) - Director | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Classes Of Employee Benefits Expense [Abstract] |  |  |
Number of directors, exercised share options | 0 | 1 | 0

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of directors, exercised share options. + References No definition available. + Details
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Namespace Prefix: | ncna_
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Balance Type: | na
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