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v3.20.2

Share-based compensation (Details) |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 shares | Jun. 30, 2020 $ / shares shares | May 31, 2019 shares | Jun. 30, 2020 $ / shares shares | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 $ / shares shares | May 27, 2019 £ / shares
Stock option |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Shares outstanding |  | 3,654,012 |  | 3,654,012 |  |  | 2,634,346 |
Exercise price | $ / shares |  | $ 9.91 |  | $ 9.91 |  |  | $ 9.57 |
Employee Share Purchase Plan |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Percentage of annual increase in reserves on total number of ordinary shares outstanding |  |  | 1.00% |  |  |  |  |
Number of ordinary shares reserved for issuance |  |  | 215,000 |  |  |  |  |
Number of shares available for issuance |  |  | 430,000 |  |  |  |  |
Increase in number of ordinary shares reserved for issuance | 179,937 |  |  |  |  |  |  |
Percentage of ordinary shares at a price per share equal to the fair market value on offering date or purchase date |  |  | 85.00% |  |  |  |  |
2020 Plan |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  | 4,773,557 |  | 4,773,557 |  |  |  |
Number of shares issued (in shares) |  | 574,679 |  |  |  |  |  |
Percentage of annual increase in reserves on total number of ordinary shares outstanding |  | 5.00% |  |  |  |  |  |
Shares outstanding |  | 0 |  | 0 |  |  |  |
2019 Plan |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  | 544,866 |  | 544,866 |  |  |  |
2019 Plan | Stock option |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Shares outstanding |  | 2,645,465 |  | 2,645,465 |  |  |  |
Contractual life |  |  | 10 years |  |  |  |  |
2019 Plan | Stock option | First anniversary |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Vesting Percentage |  |  | 25.00% |  |  |  |  |
2019 Plan | Stock option | 36 equal monthly installments |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Number of equal monthly installments for vesting remaining awards |  |  | 36 months |  |  |  |  |
2019 Plan | Minimum | Stock option |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |
2019 Plan | Maximum | Stock option |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |
Pre-IPO Share Options and restricted shares | Stock option |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Shares outstanding |  | 1,008,547 |  | 1,008,547 |  |  |  |
Contractual life |  |  |  | 10 years |  |  |  |
Vesting period |  |  |  | 4 years |  |  |  |
Pre-IPO Share Options and restricted shares | Stock option | First anniversary |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Vesting Percentage |  |  |  | 25.00% |  |  |  |
Pre-IPO Share Options and restricted shares | Stock option | 36 equal monthly installments |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Number of equal monthly installments for vesting remaining awards |  |  |  | 36 months |  |  |  |
Pre-IPO Share Options and restricted shares | Stock option | United Kingdom |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Exercise price | £ / shares |  |  |  |  |  |  |  | £ 0.01
Pre-IPO Share Options and restricted shares | Performance based option | First anniversary |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Vesting Percentage |  |  |  |  | 20.00% | 20.00% |  |
Pre-IPO Share Options and restricted shares | Performance based option | 36 equal monthly installments |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Vesting Percentage |  |  |  |  | 60.00% | 60.00% |  |
Number of equal monthly installments for vesting remaining awards |  |  |  |  | 36 months | 36 months |  |
Pre-IPO Share Options and restricted shares | Performance based option | Earlier of the fourth anniversary |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Vesting Percentage |  |  |  |  | 20.00% | 20.00% |  |

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