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Issued Capital and Reserves - Summary of Detailed Information of Ordinary Share Capital (Detail) - GBP (£)
£ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of classes of share capital [line items]    
Beginning balance £ 88,002 £ (14,971)
Issued during the period   79,210
Ending balance 69,585 80,681
Beginning balance 247,460  
Ending balance 247,460  
Share premium [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 247,460 161,785
Issued during the period   78,609
Ending balance 247,460 240,552
Beginning balance   161,785
Issued for public offering 79,001
Ending balance £ 247,460 240,552
Transaction Costs [Member] | Share premium [member]    
Disclosure of classes of share capital [line items]    
Transaction costs for issued share capital   £ (234)
Ordinary shares [member]    
Disclosure of classes of share capital [line items]    
Ordinary shares issued and fully paid, Beginning balance   338,953,141
Issued 205,557,122
Ordinary shares issued and fully paid, Ending balance 584,908,239 544,510,263
Ordinary share capital [member]    
Disclosure of classes of share capital [line items]    
Beginning balance   £ 1,017
Issued during the period 617
Ending balance £ 1,755 £ 1,634