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Shareholders’ Equity - Ordinary Shares (Details) - Ordinary shares | Sep. 30, 2018 $ / shares shares | Jun. 22, 2018 £ / shares | Jun. 22, 2018 $ / shares | Sep. 30, 2017 $ / shares shares
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Class of Stock |  |  |  |
Common stock, shares authorized (shares) | 200,000,000 |  |  | 37,426,509
Common stock, par value (usd per share) | (per share) | $ 0.000042 | £ 0.000032 | $ 0.000042 | $ 0.000042

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