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Shareholders’ Equity - Ordinary Shares (Details) | Jun. 26, 2020 | Sep. 30, 2020 $ / shares shares | Sep. 30, 2020 £ / shares shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2019 £ / shares shares | Jun. 26, 2018 USD ($)
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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 (in shares) |  | 52,298,876 | 52,298,876 | 44,983,006 | 44,983,006 |
Stock par value (usd/gbp per share) | $ / shares |  | $ 0.000042 |  | $ 0.000042 |  |
Deferred Shares |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Shares issued (in shares) |  | 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 (in shares) |  | 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 (in shares) |  | 1 | 1 | 1 | 1 |
Stock par value (usd/gbp per share) | £ / shares |  |  | £ 0.000008 |  | £ 0.000008 |

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