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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
2011 Equity Incentive Plan |  |  |
Units |  |  |
Units, beginning balance (in shares) | 937,839 | 1,605,049 | 1,736,845
Annual grant (in shares) |  | 35,000 | 520,393
Forfeitures (in shares) | (4,367) | (239,621) | (117,600)
Units, ending balance (in shares) | 451,198 | 937,839 | 1,605,049
Units, exercisable (in shares) | 0 |  |
Weighted-average strike price |  |  |
Units, beginning balance (in dollars per share) | $ 7.50 | $ 7.41 | $ 6.65
Annual grant (in dollars per share) |  | 8.00 | 8.50
Forfeitures (in dollars per share) | 7.75 | 7.74 | 7.24
Units, ending balance (in dollars per share) | 7.80 | $ 7.50 | $ 7.41
Units, exercisable (in dollars per share) | $ 0 |  |
Number of units outstanding | 451,198 |  |
Weighted-average grant-date fair market value per unit (in dollars per share) | $ 7.80 |  |
Total grant-date fair value | $ 3,519 |  |
Weighted-average accumulated percentage of service | 80.44% |  |
Stock-based compensation recognized in Additional paid-in capital | $ 2,831 |  |
Compensation expense not yet recognized | $ 688 |  |
Weighted-average period for recognition | 8 months 12 days |  |
Partial Vesting |  |  |
Units |  |  |
Partial vesting (in shares) |  |  | (534,589)
Weighted-average strike price |  |  |
Partial vesting (in dollars per share) |  |  | $ 6.01
2014 grant |  |  |
Units |  |  |
Partial vesting (in shares) |  | (38,222) |
Weighted-average strike price |  |  |
Partial vesting (in dollars per share) |  | $ 8.58 |
2015 grant |  |  |
Units |  |  |
Partial vesting (in shares) | (101,928) | (115,634) |
Weighted-average strike price |  |  |
Partial vesting (in dollars per share) | $ 6.33 | $ 6.33 |
2016 grant |  |  |
Units |  |  |
Partial vesting (in shares) | (114,045) | (134,501) |
Weighted-average strike price |  |  |
Partial vesting (in dollars per share) | $ 4.70 | $ 4.70 |
2017 grant |  |  |
Units |  |  |
Partial vesting (in shares) | (67,606) | (174,232) |
Weighted-average strike price |  |  |
Partial vesting (in dollars per share) | $ 9.20 | $ 9.20 |
2018 grant |  |  |
Units |  |  |
Partial vesting (in shares) | (163,695) |  |
Weighted-average strike price |  |  |
Partial vesting (in dollars per share) | $ 8.50 |  |
2019 grant |  |  |
Units |  |  |
Partial vesting (in shares) | (35,000) |  |
Weighted-average strike price |  |  |
Partial vesting (in dollars per share) | $ 8.00 |  |

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