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Convertible preferred shares (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |
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May 28, 2019 shares | Mar. 28, 2019 $ / shares shares | Jan. 03, 2019 USD ($) shares | Dec. 20, 2018 USD ($) shares | Oct. 27, 2017 USD ($) shares | May 26, 2017 USD ($) shares | May 31, 2019 | Jun. 30, 2019 shares | Jan. 03, 2019 £ / shares | Dec. 20, 2018 £ / shares | Oct. 27, 2017 £ / shares | May 26, 2017 £ / shares
Convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |
Number of bonus shares for each ordinary share |  |  |  |  |  |  | 1.429 |  |  |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 4,333,333 |  |  |  |  |  |  |  |  |  |
Share issue price | $ / shares |  | $ 14.00 |  |  |  |  |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  |  |  |  | 4,637,666 |  |  |  |
Conversion of convertible preferred shares to ordinary shares (in shares) |  |  |  |  |  |  |  | 11,647,529 |  |  |  |
Ordinary Shares | IPO |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible preferred shares to ordinary shares (in shares) | 11,647,529 |  |  |  |  |  |  |  |  |  |  |
Conversion ratio | 0.6997 |  |  |  |  |  |  |  |  |  |  |
Series B1 Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  | 384,615 | 3,562,583 |  |  |  |  |  |
Share issue price | £ / shares |  |  |  |  |  |  |  |  |  |  | £ 13.00 | £ 11.2278
Gross proceeds from issues of shares | $ |  |  |  |  | $ 6.6 | $ 51.9 |  |  |  |  |  |
Numbers of warrants issued |  |  |  | 194,911 | 743,287 |  |  |  |  |  |  |
Number of warrants surrendered |  |  |  | 194,911 |  |  |  |  |  |  |  |
Series B2 Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 80,385 | 1,323,248 |  |  |  |  |  |  |  |
Share issue price | £ / shares |  |  |  |  |  |  |  |  | £ 15.55 | £ 15.55 |  |
Gross proceeds from issues of shares | $ |  |  | $ 1.6 | $ 26.1 |  |  |  |  |  |  |  |

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