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Issued Capital and Reserves - Summary of Other Capital Reserves (Detail) - GBP (£)
£ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of classes of share capital [line items]    
Beginning balance £ 7,401  
Share-based payments expense during the period 2,446 £ 1,760
Ending balance 7,401  
Capital reserve [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 129,835 128,374
Share-based payments expense during the period 2,446 1,760
Share-based payments release for exercise of options (82) (108)
Issuance of warrants 70  
Ending balance 132,269 130,026
Share-based payments [member] | Capital reserve [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 23,026 19,843
Share-based payments expense during the period 2,446 1,760
Share-based payments release for exercise of options (82) (108)
Ending balance 25,390 21,495
Equity component of convertible loan [member] | Capital reserve [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 32,843 34,565
Ending balance 32,843 34,565
Other Warrents Issued [Member] | Capital reserve [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 44 44
Issuance of warrants 70  
Ending balance 114 44
Merger reserve [member] | Capital reserve [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 40,818 40,818
Ending balance 40,818 40,818
Other Reserve [Member] | Capital reserve [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 33,104 33,104
Ending balance £ 33,104 £ 33,104