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Shareholders’ Equity - Open Market Sales Agreement (Details) $ / shares in Units, $ in Millions | Sep. 30, 2020 $ / shares | Sep. 18, 2020 USD ($) | Dec. 31, 2019 $ / shares
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Class of Stock |  |  |
Commission, percentage of gross sales price |  | 0.030 |
Ordinary Shares |  |  |
Class of Stock |  |  |
Stock par value (usd/gbp per share) | $ / shares | $ 0.000042 |  | $ 0.000042
Sale of Stock, Authorized Amount | $ |  | $ 100 |

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