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Intangible Assets - Summary of Intangible Assets (Details) - GBP (£) £ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | £ 1,377 |
Ending Balance | 1,938 | £ 1,377
Cost |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 1,543 | 1,004
Additions | 725 | 539
Ending Balance | 2,268 | 1,543
Accumulated Amortization |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 166 | 77
Charge for the year | 164 | 89
Ending Balance | 330 | 166
Patents |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 1,370 |
Ending Balance | 1,813 | 1,370
Patents | Cost |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 1,533 | 1,004
Additions | 582 | 529
Ending Balance | 2,115 | 1,533
Patents | Accumulated Amortization |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 163 | 77
Charge for the year | 139 | 86
Ending Balance | 302 | 163
Computer Software |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 7 |
Ending Balance | 125 | 7
Computer Software | Cost |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 10 |
Additions | 143 | 10
Ending Balance | 153 | 10
Computer Software | Accumulated Amortization |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 3 |
Charge for the year | 25 | 3
Ending Balance | £ 28 | £ 3

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; 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 e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; 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 e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_c&doctype=Standard -URIDate 2017-03-09 + Details
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