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General Information- Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 Subsidiary
Disclosure Of General Information About Financial Statements [Abstract] |
Name of reporting entity | NuCana plc
Description of nature of entity's operations | clinical-stage biopharmaceutical company developing a portfolio of new medicines to treat patients with cancer
Domicile of entity | United Kingdom
Country of incorporation | England and Wales
Name of subsidiary | NuCana, Inc. and NuCana BioMed Trustee Company Limited
Number of subsidiaries | 2

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