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Warrant liability - Warrants information (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 28, 2019 shares | Mar. 07, 2019 | Dec. 20, 2018 shares | Oct. 27, 2017 £ / shares shares | May 26, 2017 £ / shares shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) shares
Warrants information |  |  |  |  |  |  |  |  |
Number of shares issued for warrant exercise | 171,480 |  |  |  |  |  |  |  |
Remaining warrants exercisable | 80,000 |  |  |  |  |  | 80,000 |  | 80,000
Number of shares into which remaining warrants is exercisable | 114,320 |  |  |  |  |  |  |  |
Change in fair value of preferred stock warrant liability | $ |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 5,381
Other expenses |  |  |  |  |  |  |  |  |
Warrants information |  |  |  |  |  |  |  |  |
Change in fair value of preferred stock warrant liability | $ |  |  |  |  |  |  |  |  | $ 100
Series A Preferred Shares |  |  |  |  |  |  |  |  |
Warrants information |  |  |  |  |  |  |  |  |
Numbers of warrants issued |  |  |  |  | 200,000 |  |  |  |
Exercise price of warrants | £ / shares |  |  |  |  | £ 0.01 |  |  |  |
Warrants exercisable term |  |  |  |  | 10 years |  |  |  |
Warrants expiration term following an IPO or exit |  |  |  |  | 12 months |  |  |  |
Number of warrants exercised | 120,000 |  |  |  |  |  |  |  |
Series B1 Preferred Shares |  |  |  |  |  |  |  |  |
Warrants information |  |  |  |  |  |  |  |  |
Numbers of warrants issued |  |  | 194,911 | 115,384 | 627,903 |  |  |  |
Exercise price of warrants | £ / shares |  |  |  | £ 0.01 | £ 0.01 |  |  |  |
Number of shares issued for warrant exercise | 531,077 |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  | 384,615 | 3,562,583 |  |  |  |
Share issue price | £ / shares |  |  |  |  | £ 11.2278 |  |  |  |
Number of warrants surrendered |  |  | 194,911 |  |  |  |  |  |
Percentage of warrants exercisable in conjunction with the IPO |  | 50.00% |  |  |  |  |  |  |
Percentage of warrants to expire in conjunction with the IPO |  | 50.00% |  |  |  |  |  |  |

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