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STOCK-BASED COMPENSATION (Tables) - 2015 EIP Plan | 12 Months Ended
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Dec. 31, 2020
Stock Options |
Stock Awards |
Schedule of nonvested stock amortization expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31, | ​
​ |  | 2020 | ​ | 2019 | ​ | 2018 | ​
General and administrative expenses | ​ | $ | 787 | ​ | $ | 850 | ​ | $ | 731 | ​
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31, | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ | ​
​ | ​ | Number | ​ | Average | ​ | Average | ​ | Number | ​ | Average | ​ | Average | ​ | Number | ​ | Average | ​ | Average | ​ | ​
​ | ​ | of | ​ | Exercise | ​ | Fair | ​ | of | ​ | Exercise | ​ | Fair | ​ | of | ​ | Exercise | ​ | Fair | ​ | ​
​ |  | Options |  | Price |  | Value |  | Options |  | Price |  | Price |  | Options |  | Price |  | Price | ​ | ​
Outstanding as of January 1 - Unvested |  | 322,279 |  | $ | 9.41 | ​ | ​ | 4.72 | ​ | 166,942 |  | $ | 13.01 | ​ | ​ | 7.25 | ​ | 88,667 |  | $ | 11.13 | ​ | ​ | 6.41 | ​ | ​
Granted |  | 344,568 | ​ | ​ | 7.06 | ​ | ​ | 2.01 | ​ | 240,540 | ​ | ​ | 8.33 | ​ | ​ | 3.76 | ​ | 122,608 | ​ | ​ | 13.69 | ​ | ​ | 7.55 | ​ | ​
Exercisable |  | (119,923) | ​ | ​ | 9.87 | ​ | ​ | 5.05 | ​ | (85,203) | ​ | ​ | 12.36 | ​ | ​ | 6.96 | ​ | (44,333) | ​ | ​ | 11.13 | ​ | ​ | 6.41 | ​ | ​
Exercised |  | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​
Forfeited |  | (3,378) | ​ | ​ | 8.07 | ​ | ​ | 3.76 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding as of December 31 - Unvested |  | 543,546 |  | $ | 7.83 | ​ | $ | 2.94 | ​ | 322,279 |  | $ | 9.41 | ​ | $ | 4.72 | ​ | 166,942 |  | $ | 13.01 | ​ | $ | 7.25 | ​ | ​
​ The following table summarizes certain information about the options outstanding as of December 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Options Outstanding and Unvested, | ​ | Options Outstanding and Exercisable, | ​
​ | ​ | ​ | December 31, 2020 | ​ | December 31, 2020 | ​
Weighted | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ |  | ​ | ​ | Weighted | ​
Average |  | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | Weighted | ​ | Average | ​
Exercise Price of |  | ​ | ​ | Average | ​ | Remaining | ​ | ​ | ​ | Average | ​ | Remaining | ​
Outstanding | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Number of | ​ | Exercise | ​ | Contractual | ​
Options |  | Options |  | Price |  | Life |  | Options |  | Price |  | Life |
$ | 8.86 |  | 543,546 | ​ | $ | 7.83 | ​ | 4.72 | ​ | 293,792 | ​ | $ | 10.78 | ​ | 3.01 | ​
Restricted Stock Units |
Stock Awards |
Schedule of nonvested stock amortization expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31, | ​
​ |  | 2020 | ​ | 2019 | ​ | 2018 | ​
General and administrative expenses | ​ | $ | 1,239 | ​ | $ | 1,207 | ​ | $ | 1,489 | ​
Summary of nonvested restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | 2020 | ​ | 2019 | ​ | 2018 | ​
​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​
​ | Number of | ​ | Average Grant | ​ | Number of | ​ | Average Grant | ​ | Number of | ​ | Average Grant | ​
​ | RSUs | ​ | Date Price | ​ | RSUs | ​ | Date Price | ​ | RSUs |  | Date Price |
Outstanding as of January 1 | 162,096 | ​ | $ | 9.26 | ​ | 149,170 | ​ | $ | 12.42 | ​ | 220,129 | ​ | $ | 11.01 | ​
Granted | 221,903 | ​ | ​ | 6.80 | ​ | 140,914 | ​ | ​ | 8.50 | ​ | 51,704 | ​ | ​ | 14.84 | ​
Vested | (83,675) | ​ | ​ | 9.07 | ​ | (127,988) | ​ | ​ | 12.10 | ​ | (122,663) | ​ | ​ | 10.92 | ​
Forfeited | (1,490) | ​ | ​ | 8.39 | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding as of December 31 | 298,834 | ​ | $ | 7.49 | ​ | 162,096 | ​ | $ | 9.26 | ​ | 149,170 | ​ | $ | 12.42 | ​
​ The total fair value of the RSUs that vested during the years ended December 31, 2020, 2019 and 2018 was $550, $1,235 and $1,694, respectively. The total fair value is calculated as the number of shares vested during the period multiplied by the fair value on the vesting date. ​ The following table summarizes certain information of the RSUs unvested and vested as of December 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested RSUs | ​ | Vested RSUs | ​
December 31, 2020 | ​ | December 31, 2020 | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | Weighted | ​
​ | ​ | Average | ​ | Remaining | ​ | ​ | ​ | Average | ​
Number of | ​ | Grant Date | ​ | Contractual | ​ | Number of | ​ | Grant Date | ​
RSUs |  | Price |  | Life |  | RSUs |  | Price |
298,834 | ​ | $ | 7.49 | ​ | 1.59 | ​ | 505,898 | ​ | $ | 11.07 | ​
Restricted Stock |
Stock Awards |
Schedule of nonvested stock amortization expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31, | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
General and administrative expenses | ​ | $ | — | ​ | $ | — | ​ | $ | 11 | ​
Summary of nonvested stock awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31, | ​
​ | ​ | 2018 | ​
​ | ​ | ​ | ​ | Weighted | ​
​ | ​ | Number of | ​ | Average Grant | ​
​ | ​ | Shares | ​ | Date Price | ​
Outstanding as of January 1 | ​ | 6,802 | ​ | $ | 5.20 | ​
Granted | ​ | — | ​ | ​ | — | ​
Vested | ​ | (6,802) | ​ | ​ | 5.20 | ​
Forfeited | ​ | — | ​ | ​ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding as of December 31 | ​ | — | ​ | $ | — | ​

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