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SHARE CAPITAL (Tables) | 12 Months Ended
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Dec. 31, 2023
SHARE CAPITAL |
Summary of Stock Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, 2023
​ |  | ​ |  | Weighted
​ | ​ | Number | ​ | average
​ | ​ | of | ​ | exercise
​ | ​ | options | ​ | price
Outstanding at beginning of year |  | 5,519,315 | ​ | $ | 2.28
Changes during the year: |  |  | ​ |  |
Granted |  | 1,700,410 | ​ |  | 1.84
Forfeited and expired |  | 254,124 | ​ |  | 3.81
Outstanding at end of year |  | 6,965,601 | ​ | $ | 2.13
Exercisable at end of year |  | 2,900,503 | ​ | $ | 3.10
Summary of Restricted Stock Activity | ​
​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2023 | ​
​ | ​ | Number of Restricted Stock | ​
Outstanding at beginning of year | ​ | 291,474 | ​
Changes during the year: | ​ | ​ | ​
Granted | ​ | 1,371,362 | ​
Vested | ​ | 489,166 | ​
Non vested at end of year | ​ | 1,173,670 | ​
Summary of Share Options Outstanding and Exercisable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Options outstanding | ​ | Options exercisable
​ |  | Number of |  | Weighted |  | ​ |  | Weighted
​ | ​ | options | ​ | average | ​ | ​ | ​ | average
​ | ​ | outstanding | ​ | remaining | ​ | Number of | ​ | remaining
Exercise | ​ | at end of | ​ | contractual | ​ | options | ​ | contractual
prices | ​ | year | ​ | life | ​ | exercisable | ​ | life
$1.03-$2.00 | ​ | 5,235,410 | ​ | 8.92 | ​ | 1,312,736 | ​ | 8.42
$3.55-$3.73 | ​ | 1,213,341 | ​ | 5.39 | ​ | 1,070,917 | ​ | 5.24
$4.69-$5.60 |  | 441,500 |  | 5.71 |  | 441,500 |  | 4.93
$17.20 |  | 75,350 |  | 1.19 |  | 75,350 |  | 1.19
​ |  | 6,965,601 | ​ | ​ |  | 2,900,503 | ​ | ​
Schedule of Stock Option Valuation Assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2021 | ​ | 2022 | ​ | 2023 | ​
Weighted average grants date fair value (USD) | ​ | 1.57 | ​ | 1.03 | ​ | 1.84 | ​
Exercise price (USD) | ​ | 1.57 | ​ | 1.03 |  | 1.84 | ​
Risk free rate | ​ | 0.88 | % | 3.32 | % | 4.44 | %
Volatility | ​ | 84.30 | % | 85.94 | % | 79.41 | %
Dividend yield | ​ | 0 | % | 0 | % | 0 | %
Expected life (Years) | ​ | 6 | ​ | 6 |  | 5.75 | ​
Schedule of Stock-Based Compensation Expense in Statement of Operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
(U.S. dollars in thousands) |  | 2021 |  | 2022 |  | 2023
Cost of goods sold | ​ | $ | 269 | ​ | $ | 135 | ​ | $ | 596
Research and development expenses | ​ | ​ | 648 | ​ | ​ | 518 | ​ | ​ | 777
Selling, general and administrative expenses | ​ |  | 1,458 | ​ |  | 1,432 | ​ |  | 2,075
​ | ​ | $ | 2,375 | ​ | $ | 2,085 | ​ | $ | 3,448

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