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EQUITY INCENTIVE PLAN (Tables) | 12 Months Ended
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Dec. 31, 2021
EQUITY INCENTIVE PLAN [Abstract] |
Summary of stock option activity | The following table summarizes stock option activity under our plans during the year ended December 31, 2021:
​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | Weighted-Average
​ | ​ | Options | ​ | Exercise Price
Outstanding at January 1, 2021 |  | 822,992 | ​ | $ | 4.46
Granted |  | 1,907,347 | ​ |  | 2.89
Exercised | ​ | (1,379) | ​ | ​ | 2.06
Forfeited |  | (93,673) | ​ |  | 2.82
Outstanding at December 31, 2021 |  | 2,635,287 | ​ | $ | 3.38
Exercisable at December 31, 2021 |  | 755,610 | ​ | $ | 4.62
​

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