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Intangible Assets - Summary of Intangible Assets (Detail) - GBP (£) £ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | £ 3,960 |
Ending Balance | 4,753 | £ 3,960
Cost [member] |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 4,897 | 3,682
Additions | 1,271 | 1,215
Ending Balance | 6,168 | 4,897
Accumulated Amortization [member] |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | (937) | (560)
Charge for the year | 478 | 377
Ending Balance | (1,415) | (937)
Patents [member] |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 3,717 |
Ending Balance | 4,596 | 3,717
Patents [member] | Cost [member] |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 4,523 | 3,524
Additions | 1,262 | 999
Ending Balance | 5,785 | 4,523
Patents [member] | Accumulated Amortization [member] |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | (806) | (498)
Charge for the year | 383 | 308
Ending Balance | (1,189) | (806)
Computer Software [member] |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 243 |
Ending Balance | 157 | 243
Computer Software [member] | Cost [member] |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | 374 | 158
Additions | 9 | 216
Ending Balance | 383 | 374
Computer Software [member] | Accumulated Amortization [member] |  |
Disclosure Of Intangible Assets [Line Items] |  |
Beginning Balance | (131) | (62)
Charge for the year | 95 | 69
Ending Balance | £ (226) | £ (131)

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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 2020-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + Details
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