Condensed Consolidated Balance Sheets (Parenthetical) - £ / shares	Jun. 30, 2023	Dec. 31, 2022
Ordinary shares
Shares, par value (in GBP per share)	£ 0.008	£ 0.008
Shares, authorized (in shares)	45,760,250	42,631,794
Shares, issued (in shares)	45,760,250	42,631,794
Shares, outstanding (in shares)	45,760,250	42,631,794
Deferred shares
Shares, par value (in GBP per share)	£ 21,921.504	£ 21,921.504
Shares, authorized (in shares)	0	1
Shares, issued (in shares)	0	1
Shares, outstanding (in shares)	0	1