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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)