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Capital Commitments and Contingencies - Additional Information (Details) - GBP (£) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure - Capital Commitments and Contingencies - Additional Information (Details) [Line Items] |  |  |  |  |  |
Operating lease expense |  |  |  | £ 200,000 | £ 200,000 | £ 100,000
Cardiff University | Scenario Forecast |  |  |  |  |  |
Capital Commitments [Line Items] |  |  |  |  |  |
Payments for work performed by sub-licensee |  | £ 292,607 | £ 292,607 |  |  |
Cardiff University | Renewing Significant Commitments |  |  |  |  |  |
Capital Commitments [Line Items] |  |  |  |  |  |
Research, collaboration and license agreement additional term | 2 years |  |  |  |  |
Cardiff Consultants |  |  |  |  |  |
Capital Commitments [Line Items] |  |  |  |  |  |
Milestone payments for sub-licensee |  |  |  | 1,875,000 |  |
Cardiff ProTides |  |  |  |  |  |
Capital Commitments [Line Items] |  |  |  |  |  |
Milestone payments for sub-licensee |  |  |  | £ 4,500,000 |  |

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- Definition The portion of operating lease payments that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee recognised as an expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The cash outflow for expenditure related to development projects. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Capital commitments. + References No definition available. + Details
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