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STOCK BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2021
STOCK BASED COMPENSATION |
Summary of Stock Options Outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | June 30, 2020
​ |  | ​ |  | Weighted |  | ​ |  | Weighted
​ | ​ | Number of | ​ | Average | ​ | Number of | ​ | Average
​ | ​ | Stock | ​ | Exercise | ​ | Stock | ​ | Exercise
​ | ​ | Options | ​ | Price | ​ | Options | ​ | Price
Stock options outstanding at beginning of period |  | 185,054 | ​ | $ | 7.99 |  | 37,786 | ​ | $ | 37.42
Granted |  | 94,522 | ​ |  | 3.91 |  | 125,804 | ​ |  | 1.59
Expired |  | (2,000) | ​ |  | 73.54 |  | (1,693) | ​ |  | 101.64
Stock options outstanding at end of period |  | 277,576 | ​ | $ | 6.18 |  | 161,897 | ​ | $ | 8.91
Stock options exercisable at end of period |  | 183,054 | ​ | $ | 7.35 |  | 36,093 | ​ | $ | 34.41
​ ​
Summary of Stock Options Outstanding and Exercisable by Stock Option Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Outstanding Stock Options | ​ | Exercisable Stock Options
​ |  | Number of |  | Weighted |  | Number of |  | Weighted
​ | ​ | Outstanding | ​ | Average | ​ | Stock Options | ​ | Average
Stock Option Plan | ​ | Stock Options | ​ | Exercise Price | ​ | Exercisable | ​ | Exercise Price
2004 Plan |  | 92 | ​ | $ | 1,638.00 |  | 92 | ​ | $ | 1,638.00
2004 Directors’ Plan |  | 3 | ​ |  | 10,380.00 |  | 3 | ​ |  | 10,380.00
2013 Plan |  | 277,481 | ​ |  | 5.67 |  | 182,959 | ​ |  | 6.29
​ |  | 277,576 | ​ | $ | 6.18 |  | 183,054 | ​ | $ | 7.35
Summary of RSU Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2021 | ​ | 2020
​ |  | ​ |  | Weighted- |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value | ​ | RSUs | ​ | Fair Value
Unvested RSUs at beginning of period |  | 236,403 | ​ | $ | 2.10 |  | — | ​ | $ | —
Granted |  | 184,290 | ​ |  | 4.13 |  | 211,497 | ​ |  | 2.03
Forfeited |  | — | ​ |  | — |  | — | ​ |  | —
Vested |  | (78,801) | ​ |  | 2.10 |  | — | ​ |  | —
Unvested RSUs at end of period |  | 341,892 | ​ | $ | 3.08 |  | 211,497 | ​ | $ | 2.03

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