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Share-based compensation - Share Options - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 05, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares authorized | 7,369,767 |  |  | 4,140,945
Options granted | 960,878 | 649,193 |  |
Exercise price of options | $ 52.80 | $ 28.40 |  |
Weighted-average grant-date fair value of options granted | $ 33.51 | $ 18.56 |  |
Stock Options |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to unvested share options granted | $ 73,809 |  |  |
Recognized over a weighted-average period | 1 year 10 months 24 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 | 960,878 |  | 1,067,385 |
Options granted contractual term | 10 years |  | 10 years |
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 |  | $ 27.23 |
Vesting period | 3 years |  | 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% |  | 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 |  | $ 41.59 |
Vesting period | 5 years |  | 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% |  | 33.30% |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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