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Share-based compensation - Summary of Phantom RSU Award Activity (Details) - Phantom RSU Award Plan - Phantom RSU Award - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Units |  |  |
Units, beginning balance (in shares) | 1,690,484 | 1,661,820 |
Grant (in shares) | 918,387 | 65,440 | 1,672,657
Partial vesting of 2019 Grant (in shares) | (173,916) | (5,162) |
Vesting of 2020 grant (in shares) | (65,440) |  |
Forfeitures (in shares) | (329,027) | (31,614) | (10,837)
Units, ending balance (in shares) | 2,040,488 | 1,690,484 | 1,661,820
Partial vesting grant in value | $ 1,104 | $ 18 |
Vesting grant in value | $ 416 |  |
Number of units outstanding | 2,040,488 |  |
Current share price (in dollars per share) | $ 5.83 |  |
Total fair value of the plan | $ 11,896 |  |
Weighted-average accumulated percentage of service | 44.12% |  |
Accrued liability | $ 5,248 |  |
Compensation expense not yet recognized | $ 6,648 |  |
Weighted-average period for recognition | 2 years 3 months 21 days |  |

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