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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
STOCK BASED COMPENSATION |
Summary of stock options outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024 | ​ | December 31, 2023
​ |  | ​ |  | Weighted |  | ​ |  | Weighted
​ | ​ | Number of | ​ | Average | ​ | Number of | ​ | Average
​ | ​ | Stock | ​ | Exercise | ​ | Stock | ​ | Exercise
​ | ​ | Options | ​ | Price | ​ | Options | ​ | Price
Stock options outstanding at beginning of period |  | 424,826 | ​ | $ | 2.66 |  | 356,296 | ​ | $ | 5.06
Granted |  | 224,519 | ​ |  | 0.49 |  | 117,637 | ​ | ​ | 1.01
Canceled or forfeited | ​ | — | ​ | ​ | — | ​ | (49,107) | ​ | ​ | 16.07
Stock options outstanding at end of period |  | 649,345 | ​ | ​ | 1.91 |  | 424,826 | ​ | ​ | 2.66
Stock options exercisable at end of period |  | 424,826 | ​ | $ | 2.66 |  | 307,189 | ​ | $ | 3.29
Summary of assumptions used to assess the fair value of stock options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2024 |  | 2023
Expected volatility | ​ | ​ | 100% | ​ | ​ | 99%
Expected term of options (years) | ​ | ​ | 6 | ​ | ​ | 6
Expected dividend rate | ​ | ​ | — | ​ | ​ | —
Risk-free interest rate | ​ | ​ | 4.63% | ​ | ​ | 3.51%
Weighted-average grant-date fair value | ​ | $ | 0.39 | ​ | $ | 0.81
Summary of restricted stock units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2024 | ​ | 2023
​ |  | ​ |  | Weighted- |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value | ​ | RSUs | ​ | Fair Value
Unvested RSUs at beginning of period |  | 1,773,058 | ​ | $ | 1.03 |  | 1,207,872 | ​ | $ | 1.40
Granted |  | 3,235,731 | ​ | ​ | 0.49 |  | 1,516,091 | ​ |  | 0.99
Forfeited/Expired |  | (6,784) | ​ |  | 3.93 |  | (432,587) | ​ |  | 1.67
Vested |  | (911,366) | ​ |  | 1.03 |  | (518,318) | ​ |  | 1.16
Unvested RSUs at end of period |  | 4,090,639 | ​ | $ | 0.60 |  | 1,773,058 | ​ | $ | 1.03

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