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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2025
STOCKHOLDERS' EQUITY |
Schedule of Stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  |  | Weighted |  | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | Aggregate
​ | ​ | ​ | ​ | exercise | ​ | contractual | ​ | Intrinsic
​ | ​ | Number of | ​ | price | ​ | life | ​ | value
​ | ​ | options | ​ | $ | ​ | Years | ​ | $
Options outstanding at beginning of period |  | 10,222,749 | ​ | 2.78 | ​ | 8.55 | ​ | 9
Options granted |  | 1,360,950 | ​ | 0.77 | ​ | — | ​ | —
Options exercised |  | - | ​ | — | ​ | — | ​ | —
Options expired |  | (797,216) | ​ | 5.14 | ​ | — | ​ | —
Options forfeited |  | (1,227,965) | ​ | 1.50 | ​ | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at end of period |  | 9,558,518 | ​ | 2.46 | ​ | 8.38 | ​ | 5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options vested and expected to vest at end of period |  | 7,484,313 | ​ | 2.50 | ​ | 8.31 | ​ | 3
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at end of period |  | 3,935,650 | ​ | 4.29 | ​ | 7.19 | ​ | 4
Schedule of Restricted Stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Number of
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Restricted shares
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted shares outstanding at beginning of year |  | ​ | ​ | ​ | ​ | ​ | ​ | 5,408,404
Restricted shares granted |  | ​ | ​ | ​ | ​ | ​ | ​ | 1,525,300
Restricted shares forfeited |  | ​ | ​ | ​ | ​ | ​ | ​ | (66,504)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted shares outstanding at end of period |  | ​ | ​ | ​ | ​ | ​ | ​ | 6,867,200
Schedule of assumptions used to estimate the fair values of the options granted to employees, directors and non-employees | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended |
​ | ​ | June 30, |
​ |  | 2025 | ​ | 2024 |
Volatility |  | 96.72-102.19 | % | 94.75-97.97 | %
Risk-free interest rate |  | 4.08-4.23 | % | 3.85-4.72 | %
Dividend yield |  | — | % | — | %
Expected life (years) |  | 5.00-5.87 | ​ | 5.00-5.87 | ​
Schedule of Compensation cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended
​ | ​ | June 30,
​ |  | 2025 |  | 2024
Cost of revenues | ​ | $ | 6 | ​ | $ | 5
Research and development | ​ |  | 441 | ​ |  | 448
Sales and marketing | ​ |  | 583 | ​ |  | 1,650
General and administrative | ​ |  | 1,005 | ​ |  | 1,459
​ | ​ | ​ | ​ | ​ | ​ | ​
Total stock-based compensation expenses | ​ | $ | 2,035 | ​ | $ | 3,562
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended
​ | ​ | June 30,
​ |  | 2025 |  | 2024
Cost of revenues | ​ | $ | 16 | ​ | $ | 12
Research and development | ​ |  | 966 | ​ |  | 1,563
Sales and marketing | ​ |  | 1,398 | ​ |  | 3,406
General and administrative | ​ |  | 1,997 | ​ |  | 5,439
​ | ​ | ​ | ​ | ​ | ​ | ​
Total stock-based compensation expenses | ​ | $ | 4,377 | ​ | $ | 10,420
​

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