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Share-based compensation - Summary of Activity of Restricted Share Units (Details) - Restricted Share Units - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
2011 Equity Incentive Plan |  |  |
Units |  |  |
Units, beginning balance (in shares) | 451,198 | 937,839 | 1,605,049
Annual grant (in shares) |  |  | 35,000
Forfeitures (in shares) | (11,774) | (4,367) | (239,621)
Units, ending balance (in shares) | 186,796 | 451,198 | 937,839
Units, exercisable (in shares) | 0 |  |
Weighted-average grant-date fair value |  |  |
Units, beginning balance (in dollars per share) | $ 7.80 | $ 7.50 | $ 7.41
Annual grant (in dollars per share) |  |  | 8.00
Forfeitures (in dollars per share) | 8.69 | 7.75 | 7.74
Units, ending balance (in dollars per share) | 8.70 | $ 7.80 | $ 7.50
Units, exercisable (in dollars per share) | $ 0 |  |
Number of units outstanding | 186,796 |  |
Weighted-average grant-date fair market value per unit (in dollars per share) | $ 8.70 |  |
Total grant-date fair value | $ 1,625 |  |
Weighted-average accumulated percentage of service | 85.29% |  |
Stock-based compensation recognized in Additional paid-in capital | $ 1,386 |  |
Compensation expense not yet recognized | $ 239 |  |
Weighted-average period for recognition | 3 months 18 days |  |
2014 grant |  |  |
Units |  |  |
Partial vesting (in shares) |  |  | (38,222)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) |  |  | $ 8.58
2015 grant |  |  |
Units |  |  |
Partial vesting (in shares) |  | (101,928) | (115,634)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) |  | $ 6.33 | $ 6.33
2016 grant |  |  |
Units |  |  |
Partial vesting (in shares) | (110,213) | (114,045) | (134,501)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) | $ 4.70 | $ 4.70 | $ 4.70
2017 grant |  |  |
Units |  |  |
Partial vesting (in shares) | (62,742) | (67,606) | (174,232)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) | $ 9.20 | $ 9.20 | $ 9.20
2018 grant |  |  |
Units |  |  |
Partial vesting (in shares) | (79,673) | (163,695) |
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) | $ 8.50 | $ 8.50 |
2019 grant |  |  |
Units |  |  |
Partial vesting (in shares) |  | (35,000) |
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) |  | $ 8.00 |

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