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EQUITY INCENTIVE PLAN (Tables) | 6 Months Ended
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Jun. 30, 2023
EQUITY INCENTIVE PLAN [Abstract] |
Summary of stock option activity | The following table summarizes stock option activity under our plans during the six months ended June 30, 2023:
​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | Weighted-Average
​ | ​ | Options | ​ | Exercise Price
Outstanding at January 1, 2023 |  | 3,681,336 | ​ | $ | 2.84
Granted |  | 1,100,600 | ​ |  | 0.62
Forfeited |  | (145,893) | ​ |  | 1.18
Outstanding at June 30, 2023 |  | 4,636,043 | ​ | $ | 2.36
Exercisable at June 30, 2023 |  | 2,668,542 | ​ | $ | 2.96

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