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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
STOCK-BASED COMPENSATION |
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
(in thousands) |  | 2021 |  | 2020
Stock Options | ​ | $ | 634 | ​ | $ | 300
RSUs | ​ |  | 6,509 | ​ |  | 3,789
Unrestricted Shares of Common Stock | ​ |  | 473 | ​ |  | 49
Total | ​ | $ | 7,616 | ​ | $ | 4,138
Schedule of share-based compensation, stock options, activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ |  | Intrinsic
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | Value
​ | ​ | Number of | ​ | Average | ​ | Remaining | ​ | ​ | ​ | of
​ | ​ | Options | ​ | Exercise Price | ​ | Term | ​ | Exercisable | ​ | Options
Outstanding at December 31, 2019 |  | 965,043 | ​ | $ | 3.70 |  | 3.01 |  | 759,631 | ​ | $ | 1,666,000
Granted | ​ | 220,267 | ​ |  | 12.31 |  | 5.00 |  | ​ | ​ |  | ​
Exercised |  | (433,180) | ​ |  | 2.07 |  | ​ |  | ​ | ​ |  | ​
Forfeited/Expired |  | (235,219) | ​ |  | 7.00 |  | ​ |  | ​ | ​ |  | ​
Outstanding at December 31, 2020 |  | 516,911 | ​ | $ | 7.24 |  | 2.70 |  | 294,894 | ​ | $ | 9,610,000
Granted |  | 39,186 | ​ |  | 24.78 |  | 4.93 |  | ​ | ​ |  | ​
Exercised |  | (268,836) | ​ |  | 3.73 |  | ​ |  | ​ | ​ |  | ​
Forfeited/Expired |  | (95,921) | ​ |  | 12.88 |  | ​ |  | ​ | ​ |  | ​
Outstanding at December 31, 2021 |  | 191,340 | ​ | $ | 12.94 |  | 3.96 |  | 83,070 | ​ | $ | 71,000
Exercisable as of December 31, 2021 | ​ | 83,070 | ​ | $ | 9.78 | ​ | 3.90 | ​ | ​ | ​ | $ | 44,000
Schedule of weighted average assumptions for estimating the stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |
Expected life |  | 3.25 years |  | 3.16 years | ​
Risk-free interest rate |  | 0.34 | % | 0.19 | %
Weighted average volatility factor |  | 100.60 | % | 107.28 | %
Dividend yield |  | — |  | — | ​
Schedule of non-vested restricted stock shares activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Grant Date | ​ | ​ | ​ | ​
​ | ​ | RSUs | ​ | Fair Value | ​ | Vested | ​ | Unvested
Restricted stock units outstanding as of December 31, 2020 |  | 958,378 | ​ | $ | 11.57 | ​ | 285,108 | ​ | 673,270
Granted |  | 648,226 | ​ | ​ | 19.44 | ​ | ​ | ​ | ​
Settled |  | (283,568) | ​ | ​ | 15.24 | ​ | ​ | ​ | ​
Forfeited/Canceled |  | (289,796) | ​ | ​ | 19.92 | ​ | ​ | ​ | ​
Restricted stock units outstanding at December 31, 2021 |  | 1,033,240 | ​ | $ | 13.10 | ​ | 340,539 | ​ | 692,701
Schedule of other share-based compensation, activity | The following table summarizes the warrant activity for the years ended December 31, 2021 and 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | Intrinsic
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Value
​ | ​ | Number of | ​ | Average | ​ | Remaining | ​ | of
​ | ​ | Warrants | ​ | Exercise Price | ​ | Term | ​ | Warrants
Outstanding at December 31, 2019 |  | 424,708 | ​ | $ | 5.31 |  | 0.82 | ​ | $ | 189,000
Exercised |  | (321,467) | ​ |  | 4.77 |  | ​ | ​ |  | ​
Forfeited/Expired |  | (22,188) | ​ |  | 9.59 |  | ​ | ​ |  | ​
Outstanding at December 31, 2020 |  | 81,053 | ​ | ​ | 6.25 |  | 0.94 | ​ | ​ | 1,587,000
Exercised |  | (38,880) | ​ |  | 6.25 |  | ​ | ​ |  | ​
Forfeited/Expired |  | (12,000) | ​ |  | 6.25 |  | ​ | ​ |  | ​
Outstanding at December 31, 2021 |  | 30,173 | ​ | $ | 6.25 |  | 0.71 | ​ | $ | 23,000
​

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