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Share-based compensation - Share Options - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Oct. 31, 2021 | Mar. 05, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized | 7,369,767 |  | 7,369,767 |  | 7,345 | 4,140,945
Weighted-average grant-date fair value of options granted |  |  | $ 82.21 | $ 34.91 |  |
Stock Options |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense | $ 7,175 | $ 5,363 | $ 19,951 | $ 15,718 |  |
Unrecognized compensation expense related to unvested share options granted | $ 93,248 |  | $ 93,248 |  |  |
Recognized over a weighted-average period |  |  | 1 year 4 months 20 days |  |  |
Management, Employees and Individual Advisors | Two Thousand Seventeen Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Options granted |  |  | 553,198 | 1,059,431 |  |
Exercise price of options |  |  | $ 180.00 |  |  |
Options granted contractual term |  |  | 10 years | 10 years |  |
Vesting period |  |  | 5 years |  |  |
Management, Employees and Individual Advisors | Vesting anniversary year after the grant date | Two Thousand Seventeen Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Option vesting percentage |  |  | 20.00% |  |  |
Management, Employees and Individual Advisors | Minimum | Two Thousand Seventeen Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Exercise price of options |  |  |  | $ 44.94 |  |
Vesting period |  |  | 3 years |  |  |
Management, Employees and Individual Advisors | Minimum | Vesting anniversary year after the grant date | Two Thousand Seventeen Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Option vesting percentage |  |  |  | 20.00% |  |
Management, Employees and Individual Advisors | Maximum | Two Thousand Seventeen Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Exercise price of options |  |  |  | $ 82.50 |  |
Vesting period |  |  | 5 years |  |  |
Management, Employees and Individual Advisors | Maximum | Vesting anniversary year after the grant date | Two Thousand Seventeen Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Option vesting percentage |  |  |  | 33.30% |  |

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