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Significant Accounting Policies - Additional Information (Details) £ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 GBP (£) Segment | Dec. 31, 2016 GBP (£) | Dec. 31, 2015 GBP (£) | Dec. 31, 2014 GBP (£)
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | £ | £ 86,703 | £ 19,990 | £ 14,112 | £ 18,761
Number of operating segment | Segment | 1 |  |  |
Cash at banks maturity period | Less than three months |  |  |
Certificates of deposits maturity period | Greater than three months but less than one year |  |  |
Maximum |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Income tax credit, cash rebate percentage | 33.35% |  |  |
Patents |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Patent life | 20 years |  |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The useful lives or amortisation rates used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Cash at banks maturity period. + References No definition available. + Details
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- Definition Certificates of deposits maturity period. + References No definition available. + Details
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- Definition Income tax credit, cash rebate percentage. + References No definition available. + Details
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