Loss Per Ordinary Equity Share (Basic and Diluted) - Additional Information (Details) - GBP (£) £ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Ordinary Equity Share Basic And Diluted Earnings Loss Per Share [Abstract]
Net loss used in the calculation of loss per share	£ 39,410	£ 32,550	£ 19,580
Weighted average ordinary shares issued	88,950,441	81,772,124	75,126,869

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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