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Nature of the business and basis of presentation - Initial public offering (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
May 28, 2019 shares | Mar. 28, 2019 $ / shares shares | Jun. 30, 2019 shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2020 USD ($)
Share capital reorganization and share split |  |  |  |  |
Offering expenses | $ |  |  |  | $ 8.4 |
Ordinary Shares |  |  |  |  |
Share capital reorganization and share split |  |  |  |  |
Shares issued (in shares) |  |  |  | 4,637,666 |
Conversion of convertible preferred shares to ordinary shares (in shares) |  |  |  | 11,647,529 |
IPO |  |  |  |  |
Share capital reorganization and share split |  |  |  |  |
Shares issued (in shares) |  | 4,333,333 |  |  |
Share issue price | $ / shares |  | $ 14.00 |  |  |
Proceeds from IPO, net | $ |  |  |  |  | $ 56.4
Underwriting discounts and commissions | $ |  |  |  |  | 4.5
Offering expenses | $ |  |  |  |  | $ 4.0
IPO | Ordinary Shares |  |  |  |  |
Share capital reorganization and share split |  |  |  |  |
Conversion of convertible preferred shares to ordinary shares (in shares) | 11,647,529 |  |  |  |
Conversion ratio | 0.6997 |  |  |  |
Over allotment option |  |  |  |  |
Share capital reorganization and share split |  |  |  |  |
Shares issued (in shares) |  |  | 304,333 |  |

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