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v3.20.2

Share-based compensation (Details) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 shares | Jun. 30, 2020 shares | May 31, 2019 shares | Sep. 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 |  | 3,779,785 |  |  | 2,634,346 |
Exercise price | $ / shares |  |  |  | $ 10.24 |  |  | $ 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 |  | 4,615,024 |  |  |  |
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 |  |  |  | 145,050 |  |  |  |
2020 Plan | Stock option |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Contractual life |  |  |  | 10 years |  |  |  |
Vesting period |  |  |  | 4 years |  |  |  |
2020 Plan | Stock option | First anniversary |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Vesting Percentage |  |  |  | 25.00% |  |  |  |
2020 Plan | Stock option | 36 equal monthly installments |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Number of equal monthly installments for vesting remaining awards |  |  |  | 36 months |  |  |  |
2019 Plan |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  | 544,866 |  |  |  |  |  |
2019 Plan | Stock option |  |  |  |  |  |  |  |
Share-based compensation. |  |  |  |  |  |  |  |
Shares outstanding |  |  |  | 2,634,962 |  |  |  |
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 |  |  |  | 999,773 |  |  |  |
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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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