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SHARE CAPITAL (Tables) | 12 Months Ended
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Dec. 31, 2022
SHARE CAPITAL |
Summary of Stock Option Activity |
| a) | Options granted to employees and directors:
​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2022
​ |  | ​ |  | Weighted
​ | ​ | Number | ​ | average
​ | ​ | of | ​ | exercise
​ | ​ | options | ​ | price
Outstanding at beginning of year |  | 2,259,020 | ​ | $ | 4.42
Changes during the year: |  |  | ​ |  |
Granted |  | 3,480,000 | ​ |  | 1.03
Forfeited and expired |  | 219,705 | ​ |  | 4.62
Outstanding at end of year |  | 5,519,315 | ​ | $ | 2.28
Exercisable at end of year |  | 1,731,434 | ​ | $ | 4.25
​
Summary of Restricted Stock Activity | ​
​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2022 | ​
​ | ​ | Number of Restricted Stock | ​
Outstanding at beginning of year | ​ | 458,027 | ​
Changes during the year: | ​ | ​ | ​
Granted | ​ | 759,482 | ​
Vested | ​ | 926,035 | ​
Non vested at end of year | ​ | 291,474 | ​
Summary of Share Options Outstanding and Exercisable |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | 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 | ​ | 3,610,000 | ​ | 9.60 | ​ | 300,625 | ​ | 8.99
$3.55-$3.73 | ​ | 1,361,965 | ​ | 6.78 | ​ | 903,459 | ​ | 6.48
$4.69-$5.60 |  | 466,000 |  | 5.71 |  | 446,000 |  | 5.67
$17.20 |  | 81,350 |  | 2.10 |  | 81,350 |  | 2.10
​ |  | 5,519,315 | ​ | ​ |  | 1,731,434 | ​ | ​
Schedule of Stock Option Valuation Assumptions |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2020 | ​ | 2021 | ​ | 2022 | ​
Stock price (USD) | ​ | 3.64 | ​ | 1.57 | ​ | 1.03 | ​
Exercise price (USD) | ​ | 3.64 | ​ | 1.57 |  | 1.03 | ​
Risk free rate | ​ | 0.74 | % | 0.88 | % | 3.32 | %
Volatility | ​ | 79.50 | % | 84.30 | % | 85.94 | %
Dividend yield | ​ | 0 | % | 0 | % | 0 | %
Expected life (Years) | ​ | 6 | ​ | 6 | ​ | 6 | ​
Schedule of Stock-Based Compensation Expense in Statement of Operations |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(U.S. dollars in thousands) |  | 2020 |  | 2021 |  | 2022
Cost of goods sold | ​ | ​ | ​ | ​ | $ | 269 | ​ | $ | 135
Research and development expenses | ​ | $ | 1,036 | ​ | ​ | 648 | ​ | ​ | 518
Selling, general and administrative expenses | ​ |  | 2,090 | ​ |  | 1,458 | ​ |  | 1,432
​ | ​ | $ | 3,126 | ​ | $ | 2,375 | ​ | $ | 2,085

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