Consolidated Balance Sheets (Parenthetical) - £ / shares	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Common stock, nominal value (in pound sterling per share)	£ 0.002	£ 0.002
Common stock, shares authorized (in shares)	152,500,000	152,500,000
Common stock, shares issued (in shares)	94,271,917	89,988,228
Common Stock, shares outstanding (in shares)	94,271,917	89,988,228