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Warrants - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 shares | Dec. 31, 2022 £ / shares shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2017 £ / shares shares
Other Liabilities Disclosure [Abstract] |  |  |  |
Number of warrants exercised and forfeited | 0 | 0 |  |
Stock warrants (in shares) |  |  | 12,401,262 | 31,115,926
Issue price of warrants (in pounds sterling per share) | £ / shares |  |  |  | £ 1.4365
Number of shares called by each warrant |  |  |  | 0.4
Exercise price of stock warrant (in pound sterling per share) | £ / shares |  | £ 1.7238 |  | £ 1.7238
Number of outstanding warrants |  |  | 31,003,155 |
Intrinsic value | $ |  |  | $ 0 |

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