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STOCK-BASED COMPENSATION (Tables) - 2015 EIP Plan | 6 Months Ended
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Jun. 30, 2021
Stock Options |
Stock Awards |
Schedule of nonvested stock amortization expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended | ​ | For the Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 |  | 2020 |
General and administrative expenses | ​ | $ | 151 | ​ | $ | 192 | ​ | $ | 330 | ​ | $ | 397 | ​
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ | ​ | ​
​ | ​ | Number | ​ | Average | ​ | Average | ​ | ​ | ​
​ | ​ | of | ​ | Exercise | ​ | Fair | ​ | ​ | ​
​ |  | Options |  | Price |  | Value |  | ​ | ​
Outstanding as of January 1, 2021 |  | 837,338 |  | $ | 8.86 | ​ | ​ | 4.02 | ​ | ​ | ​
Granted |  | 118,552 | ​ | ​ | 9.91 | ​ | ​ | 4.33 | ​ | ​ | ​
Exercised |  | (24,544) | ​ | ​ | 7.34 | ​ | ​ | 2.49 | ​ | ​ | ​
Forfeited |  | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding as of June 30, 2021 |  | 931,346 |  | $ | 9.04 | ​ | $ | 4.10 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable as of June 30, 2021 |  | 504,028 |  | $ | 9.88 | ​ | $ | 5.04 | ​ | ​ | ​
​ ​ The following table summarizes certain information about the options outstanding as of June 30, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Options Outstanding and Unvested, | ​ | Options Outstanding and Exercisable, | ​
​ | ​ | ​ | June 30, 2021 | ​ | June 30, 2021 | ​
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 |
$ | 9.04 |  | 427,318 | ​ | $ | 8.04 | ​ | 4.75 | ​ | 504,028 | ​ | $ | 9.88 | ​ | 3.11 | ​
​
Restricted Stock Units |
Stock Awards |
Schedule of nonvested stock amortization expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the Three Months Ended | ​ | For the Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ | ​ | 2021 | ​ | 2020 |  | 2021 |  | 2020 |
General and administrative expenses | ​ | $ | 401 | ​ | $ | 284 | ​ | $ | 743 | ​ | $ | 560 | ​
Summary of nonvested restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Weighted | ​
​ | Number of | ​ | Average Grant | ​
​ | RSUs | ​ | Date Price | ​
Outstanding as of January 1, 2021 | 298,834 | ​ | $ | 7.49 | ​
Granted | 156,445 | ​ | ​ | 11.85 | ​
Vested | (148,924) | ​ | ​ | 7.66 | ​
Forfeited | — | ​ | ​ | — | ​
​ | ​ | ​ | ​ | ​ | ​
Outstanding as of June 30, 2021 | 306,355 | ​ | $ | 9.64 | ​
​ The total fair value of the RSUs that vested during the six months ended June 30, 2021 and 2020 was $1,798 and $352, 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 June 30, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested RSUs | ​ | Vested RSUs | ​
June 30, 2021 | ​ | June 30, 2021 | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | Weighted | ​
​ | ​ | Average | ​ | Remaining | ​ | ​ | ​ | Average | ​
Number of | ​ | Grant Date | ​ | Contractual | ​ | Number of | ​ | Grant Date | ​
RSUs |  | Price |  | Life |  | RSUs |  | Price |
306,355 | ​ | $ | 9.64 | ​ | 1.87 | ​ | 654,821 | ​ | $ | 10.30 | ​
​

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