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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2022
STOCK-BASED COMPENSATION |
Summary of Stock Options Outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 | ​ | December 31, 2021
​ |  | ​ |  | Weighted |  | ​ |  | Weighted
​ | ​ | Number of | ​ | Average | ​ | Number of | ​ | Average
​ | ​ | Stock | ​ | Exercise | ​ | Stock | ​ | Exercise
​ | ​ | Options | ​ | Price | ​ | Options | ​ | Price
Stock options outstanding at beginning of period |  | 277,576 | ​ | $ | 6.18 |  | 185,054 | ​ | $ | 7.70
Granted |  | 78,720 | ​ |  | 1.09 |  | 94,522 | ​ |  | 3.91
Expired |  | — | ​ |  | — |  | (2,000) | ​ |  | 73.54
Stock options outstanding at end of period |  | 356,296 | ​ | ​ | 5.06 |  | 277,576 | ​ | ​ | 6.18
Stock options exercisable at end of period |  | 277,576 | ​ | $ | 6.18 |  | 183,054 | ​ | $ | 7.35
​
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 |  | 356,201 | ​ |  | 4.55 |  | 277,481 | ​ |  | 5.53
​ |  | 356,296 | ​ | $ | 5.06 |  | 277,576 | ​ | $ | 6.18
​
Summary of Assumptions Used to Assess the Fair Value of Stock Options Granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2022 |  | 2021
Expected volatility | ​ | ​ | 105% | ​ | ​ | 113%
Expected term of options (years) | ​ | ​ | 6 | ​ | ​ | 6
Expected dividend rate | ​ | ​ | — | ​ | ​ | —
Risk-free interest rate | ​ | ​ | 2.95% | ​ | ​ | 0.82%
Expected forfeiture rate | ​ | ​ | — | ​ | ​ | —
Weighted-average grant-date fair value | ​ | $ | 0.89 | ​ | $ | 3.28
Summary of RSU Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
​ |  | ​ |  | Weighted- |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value | ​ | RSUs | ​ | Fair Value
Unvested RSUs at beginning of period |  | 385,004 | ​ | $ | 3.18 |  | 236,403 | ​ | $ | 2.10
Granted |  | 1,229,950 | ​ | ​ | 1.16 |  | 227,402 | ​ |  | 3.93
Forfeited/Expired |  | (225,091) | ​ |  | 2.39 |  | — | ​ |  | —
Vested |  | (181,991) | ​ |  | 2.31 |  | (78,801) | ​ |  | 2.10
Unvested RSUs at end of period |  | 1,207,872 | ​ | $ | 1.40 |  | 385,004 | ​ | $ | 3.18
​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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