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EQUITY INCENTIVE PLAN (Tables) | 6 Months Ended
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Jun. 30, 2022
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, 2022:
​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | Weighted-Average
​ | ​ | Options | ​ | Exercise Price
Outstanding at January 1, 2022 |  | 2,635,287 | ​ | $ | 3.38
Granted |  | 1,074,000 | ​ |  | 1.51
Forfeited |  | (48,830) | ​ |  | 2.44
Outstanding at June 30, 2022 |  | 3,660,457 | ​ | $ | 2.85
Exercisable at June 30, 2022 |  | 1,605,306 | ​ | $ | 3.46

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