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Nature of the Business (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 26, 2018 $ / shares shares | Jun. 22, 2018 USD ($) | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) | Jun. 22, 2018 £ / shares | Jun. 22, 2018 $ / shares | Sep. 30, 2015 USD ($)
Class of Stock |  |  |  |  |  |  |  |
Equity conversion ratio |  | 3.185 |  |  |  |  |  |
Net loss |  |  | $ 44,751 | $ 19,727 | $ 12,550 |  |  |
Accumulated deficit |  |  | 92,653 | 47,902 |  |  |  |
Cash |  |  | $ 247,089 | $ 137,070 | $ 28,059 |  |  | $ 10,203
Ordinary shares |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Common stock, par value (usd/gbp per share) | (per share) |  |  | $ 0.000042 | $ 0.000042 |  | £ 0.000032 | $ 0.000042 |
Ordinary shares | IPO |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Number of shares issued in transaction (shares) | shares | 10,147,059 |  |  |  |  |  |  |
Per share price of issuance (usd per share) | $ / shares | $ 17.00 |  |  |  |  |  |  |
Proceeds of issuance of ordinary shares, net of issuance costs |  | $ 156,500 |  |  |  |  |  |
Ordinary shares | Options |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Number of shares issued in transaction (shares) | shares | 1,323,529 |  |  |  |  |  |  |

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