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Share-based compensation - Share Options - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 05, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares authorized | 7,369,767 |  | 7,369,767 |  | 4,140,945
Weighted-average grant-date fair value of options granted |  |  | $ 81.37 | $ 33.51 |
Stock Options |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Compensation expense | $ 7,227 | $ 5,434 | $ 12,776 | $ 10,355 |
Unrecognized compensation expense related to unvested share options granted | $ 97,837 |  | $ 97,837 |  |
Recognized over a weighted-average period |  |  | 1 year 5 months 23 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 |  |  | 512,088 | 960,878 |
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 |  |  |  | $ 82.13 |
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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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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