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Share-Based Compensation - Restricted Share Unit (Details)
 9 Months Ended
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
£ / shares
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
Dec. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested (in shares) | shares 2,929,746 2,929,746    
Unvested (in dollars per share) | $ / shares $ 16.68 $ 16.68    
Granted (in shares) | shares 2,000,783 2,000,783    
Granted (in dollars per share) | $ / shares $ 10.29   $ 22.71  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested (in shares) | shares 226,395 226,395   115,140
Unvested (in dollars per share) | $ / shares $ 11.59 $ 11.59   $ 10.19
Granted (in shares) | shares 143,830 143,830    
Granted (in dollars per share) | $ / shares $ 14.89      
Vested (shares) | shares (31,975) (31,975)    
Vested (in dollars per share) | $ / shares $ 9.94      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares | shares (600) (600)    
Forfeited (in dollars per share) | $ / shares $ 14.68      
Unrecognized compensation cost | $ $ 2,200,000 $ 2,200,000 $ 1,600,000  
Period for recognition (in years) 3 years 3 years 2 years 11 months 12 days  
Exercise price (in pound sterling per share) | £ / shares   $ 0.01