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Shareholders’ Equity - Ordinary Shares (Details) | Dec. 31, 2019 £ / shares shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 £ / shares shares | Dec. 31, 2018 $ / shares shares | Jun. 26, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Ordinary shares |  |  |  |  |
Class of Stock |  |  |  |  |
Maximum nominal shares authorized for grant | $ |  |  |  |  | $ 8,400
Common stock, shares, issued (shares) | 44,983,006 | 44,983,006 | 40,145,617 | 40,145,617 |
Common stock, par value (usd/gbp per share) | $ / shares |  | $ 0.000042 |  | $ 0.000042 |
Deferred Shares |  |  |  |  |
Class of Stock |  |  |  |  |
Common stock, shares, issued (shares) | 34,425 | 34,425 | 0 | 0 |
Common stock, par value (usd/gbp per share) | £ / shares | £ 0.00001 |  | £ 0.00001 |  |
Deferred B shares |  |  |  |  |
Class of Stock |  |  |  |  |
Common stock, shares, issued (shares) | 88,893,548 | 88,893,548 | 0 | 0 |
Common stock, par value (usd/gbp per share) | £ / shares | £ 0.00099 |  | £ 0.00099 |  |
Deferred C shares |  |  |  |  |
Class of Stock |  |  |  |  |
Common stock, shares, issued (shares) | 1 | 1 | 0 | 0 |
Common stock, par value (usd/gbp per share) | £ / shares | £ 0.000008 |  | £ 0.000008 |  |

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