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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
STOCK BASED COMPENSATION |
Summary of Stock Options Outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021 | ​ | December 31, 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 | ​ | $ | 7.70 |  | 37,786 | ​ | $ | 37.42
Granted |  | 94,522 | ​ |  | 3.91 |  | 149,801 | ​ |  | 1.67
Expired |  | (2,000) | ​ |  | 73.54 |  | (2,533) | ​ |  | 93.80
Stock options outstanding at end of period |  | 277,576 | ​ | ​ | 6.18 |  | 185,054 | ​ | ​ | 7.70
Stock options exercisable at end of period |  | 183,054 | ​ | $ | 7.35 |  | 35,253 | ​ | $ | 33.37
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 | ​ |  | 5.53 |  | 182,959 | ​ |  | 6.36
​ |  | 277,576 | ​ | $ | 6.18 |  | 183,054 | ​ | $ | 7.35
​
Summary of Assumptions Used to Assess the Fair Value of Stock Options Granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2021 |  | 2020
Expected volatility | ​ | ​ | 113% | ​ | ​ | 101%
Expected term of options (years) | ​ | ​ | 6 | ​ | ​ | 6
Expected dividend rate | ​ | ​ | — | ​ | ​ | —
Risk-free interest rate | ​ | ​ | 0.82% | ​ | ​ | 0.31%
Expected forfeiture rate | ​ | ​ | — | ​ | ​ | —
Weighted-average grant-date fair value | ​ | $ | 3.28 | ​ | $ | 1.64
​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of RSU Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 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 |  | 511 | ​ | $ | 70.00
Granted |  | 227,402 | ​ |  | 3.93 |  | 236,403 | ​ |  | 2.10
Vested |  | (78,801) | ​ |  | 2.10 |  | (511) | ​ |  | 70.00
Unvested RSUs at end of period |  | 385,004 | ​ | $ | 3.18 |  | 236,403 | ​ | $ | 2.10

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