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Share-based compensation - Non-vested Restricted Shares - Additional Information (Details) - Non-Vested Restricted Shares - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized share-based compensation | $ 46,885 |  | $ 46,885 |
Compensation expense | $ 3,381 | $ 1,615 | $ 8,155 | $ 4,687
Independent Directors |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares granted |  |  | 19,260 | 50,000
Management |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares granted |  |  | 271,509 | 71,250
Management | Each yearly anniversary from the date of the agreement |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Option vesting percentage |  |  | 20.00% | 20.00%

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