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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of activity of stock options | The following table summarizes the activity of stock options during fiscal years 2020, 2019 and 2018:
|  | Units |  | Weighted-average strike price |  | Weighted-average grant-date fair value
Outstanding at December 31, 2017 |  | 634,489 |  |  | 14.28 |  |  | 4.28 |
Expired (i) |  | (143,416) |  |  | 21.20 |  |  | 5.89 |
Outstanding at December 31, 2018 |  | 491,073 |  |  | 12.26 |  |  | 3.81 |
Expired (i) |  | (216,633) |  |  | 14.35 |  |  | 5.13 |
Outstanding at December 31, 2019 |  | 274,440 |  |  | 10.62 |  |  | 2.77 |
Expired (i) |  | (97,672) |  |  | 14.31 |  |  | 4.19 |
Outstanding at December 31, 2020 |  | 176,768 |  |  | 8.58 |  |  | 1.98 |
Exercisable at December 31, 2020 |  | 176,768 |  |  | 8.58 |  |  | 1.98 |
(i)As of December 31, 2020, 2019 and 2018, additional paid-in capital included $409, $1,111 and $844, respectively, related to expired stock options. The following table provides a summary of outstanding stock options at December 31, 2020:
|  | Vested (i) |  |  |  |
Number of units outstanding |  | 176,768 |  |  |  |  |
Weighted-average grant-date fair market value per unit |  | 1.98 |  |  |  |  |
Total grant-date fair value |  | 350 |  |  |  |  |
Weighted-average accumulated percentage of service |  | 100 | % |  |  |  |
Stock-based compensation recognized in Additional paid-in capital |  | 350 |  |  |  |  |
(i)Related to exercisable awards.
Summary of activity of restricted share units | The following table summarizes the activity of restricted share units during fiscal years 2020, 2019 and 2018:
|  | Units |  | Weighted-average grant-date fair value |
Outstanding at December 31, 2017 |  | 1,736,845 |  |  | 6.65 |  |
2018 annual grant |  | 520,393 |  |  | 8.50 |  |
Partial vesting |  | (534,589) |  |  | 6.01 |  |
Forfeitures |  | (117,600) |  |  | 7.24 |  |
Outstanding at December 31, 2018 |  | 1,605,049 |  |  | 7.41 |  |
2019 annual grant |  | 35,000 |  |  | 8.00 |  |
Partial vesting of 2014 grant |  | (38,222) |  |  | 8.58 |  |
Partial vesting of 2015 grant |  | (115,634) |  |  | 6.33 |  |
Partial vesting of 2016 grant |  | (134,501) |  |  | 4.70 |  |
Partial vesting of 2017 grant |  | (174,232) |  |  | 9.20 |  |
Forfeitures |  | (239,621) |  |  | 7.74 |  |
Outstanding at December 31, 2019 |  | 937,839 |  |  | 7.50 |  |
Partial vesting of 2015 grant |  | (101,928) |  |  | 6.33 |  |
Partial vesting of 2016 grant |  | (114,045) |  |  | 4.70 |  |
Partial vesting of 2017 grant |  | (67,606) |  |  | 9.20 |  |
Partial vesting of 2018 grant |  | (163,695) |  |  | 8.50 |  |
Vesting of 2019 grant |  | (35,000) |  |  | 8.00 |  |
Forfeitures |  | (4,367) |  |  | 7.75 |  |
Outstanding at December 31, 2020 |  | 451,198 |  |  | 7.80 |  |
Exercisable at December 31, 2020 |  | — |  |  | — |  |
The following table provides a summary of outstanding restricted share units at December 31, 2020: Restricted Share Units (continued)
Number of units outstanding (i) | 451,198 |
Weighted-average grant-date fair market value per unit | 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 (ii) | 688 |
(i)Related to awards that will vest between fiscal years 2021 and 2023. (ii)Expected to be recognized in a weighted-average period of 0.7 years.
Summary of phantom RSU award activity | The following table summarizes the activity under the plan as of December 31, 2020:
|  | Units |  |  |  |
Outstanding at December 31, 2019 |  | 1661820 |  |  |  |  |  |
Grant 2020 |  | 65,440 |  |  |  |  |  |  |
Partial vesting of 2019 Grant |  | (5,162) |  |  |  |  |  |
Forfeitures |  | (31,614) |  |  |  |  |  |  |
Outstanding at December 31, 2020 |  | 1,690,484 |  |  |  |  |  |  |
Exercisable at December 31, 2020 |  | — |  |  |  |  |  |  |
Phantom RSU Award (continued)
|  |  |  | Total Non-vested (i) |  |
Number of units outstanding |  |  |  | 1,690,484 |  |  |  |
Current share price |  |  |  | 5.03 |  |  |  |
Total fair value of the plan |  |  |  | 8,503 |  |  |  |
Weighted-average accumulated percentage of service |  |  |  | 39.00 | % |  |  |  |
Accrued liability (ii) |  |  |  | 3,316 |  |  |  |
Compensation expense not yet recognized (iii) |  |  |  | 5,187 |  |  |  |
(i)Related to awards that will vest between May 2021 and May 2024. (ii)Presented within “Accrued payroll and other liabilities” in the Company’s current and non current liabilities balance sheet. (iii)Expected to be recognized in a weighted-average period of 2.93 years.

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