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Shareholders’ Equity - Ordinary Shares (Details) | Jun. 26, 2018 USD ($) | Sep. 30, 2021 $ / shares shares | Sep. 30, 2021 £ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2020 £ / shares shares
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Class of Stock |  |  |  |  |
Authorized grant, life | 5 years |  |  |  |
Ordinary shares |  |  |  |  |
Class of Stock |  |  |  |  |
Maximum nominal shares authorized for grant | $ | $ 8,400 |  |  |  |
Shares issued |  | 72,918,994 | 72,918,994 | 52,346,231 | 52,346,231
Stock par value (usd/gbp per share) | $ / shares |  | $ 0.000042 |  | $ 0.000042 |
Deferred Shares |  |  |  |  |
Class of Stock |  |  |  |  |
Shares issued |  | 34,425 | 34,425 | 34,425 | 34,425
Stock par value (usd/gbp per share) | £ / shares |  |  | £ 0.00001 |  | £ 0.00001
Deferred B Shares |  |  |  |  |
Class of Stock |  |  |  |  |
Shares issued |  | 88,893,548 | 88,893,548 | 88,893,548 | 88,893,548
Stock par value (usd/gbp per share) | £ / shares |  |  | £ 0.00099 |  | £ 0.00099
Deferred C Shares |  |  |  |  |
Class of Stock |  |  |  |  |
Shares issued |  | 1 | 1 | 1 | 1
Stock par value (usd/gbp per share) | £ / shares |  |  | £ 0.000008 |  | £ 0.000008

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