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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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