Share-Based Compensation - Restricted Share Unit (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) £ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares) | shares			210,080
Unvested and Outstanding, ending balance (in shares) | shares	2,566,715	2,566,715
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted (in dollars per share) | $ / shares	$ 11.38		$ 26.73
Weighted Average Grant Date Fair Value, ending balance (in dollars per share) | $ / shares	$ 21.57
Ordinary shares | Common stock
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Vested (shares) | shares	(10,659)	(10,659)
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Unvested and Outstanding, beginning balance (in shares) | shares	115,140	115,140
Granted (in shares) | shares	92,590	92,590
Forfeited (in shares) | shares	0	0
Unvested and Outstanding, ending balance (in shares) | shares	197,071	197,071
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, beginning balance (in dollars per share) | $ / shares	$ 10.19
Granted (in dollars per share) | $ / shares	13.56
Vested (in dollars per share) | $ / shares	10.60
Forfeited (in dollars per share) | $ / shares	0
Weighted Average Grant Date Fair Value, ending balance (in dollars per share) | $ / shares	$ 12.69
Unrecognized compensation cost | $	$ 2.3	$ 2.3	$ 1.9
Period for recognition (in years)	3 years 2 months 12 days	3 years 2 months 12 days	3 years 1 month 6 days
Exercise price (in pound sterling per share) | £ / shares		$ 0.01