Consolidated Balance Sheets (Parenthetical) - £ / shares	Dec. 31, 2022	Dec. 31, 2021
Ordinary shares
Common stock, par value (in GBP per share)	£ 0.008	£ 0.008
Common stock, authorized (in shares)	42,631,794	42,019,874
Common stock, issued (in shares)	42,631,794	42,019,874
Common stock, outstanding (in shares)	42,631,794	42,019,874
Deferred Shares
Common stock, par value (in GBP per share)	£ 21,921.504	£ 21,921.504
Common stock, authorized (in shares)	1	1
Common stock, issued (in shares)	1	1
Common stock, outstanding (in shares)	1	1