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Intangible Assets - Summary of Intangible Assets (Details) - GBP (£)
£ in Thousands
 12 Months Ended
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