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Basic and Diluted Loss Per Share - Schedule of Basic and Diluted Loss Per Share (Detail) - GBP (£)
£ / shares in Units, £ in Thousands, shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Loss for the year £ (30,682) £ (21,412) £ (13,840)
Basic and diluted weighted average number of shares 37,882 32,327 31,972
Basic and diluted loss per share £ (0.81) £ (0.66) £ (0.43)