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SHARE CAPITAL (Tables) | 12 Months Ended
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Dec. 31, 2020
SHARE CAPITAL |
Schedule of Options and Restricted Stocks Granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ | ​ |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | No. of options or | ​ | ​ | ​ | ​ | ​ | ​ | Fair value | ​ | ​
​ | ​ | restricted stock | ​ | Exercise | ​ | Vesting | ​ | at grant (U.S. dollars | ​ | Expiration
Year of grant | ​ | granted | ​ | price | ​ | period | ​ | in thousands) | ​ | period
2018 | ​ | 400,000 | ​ | $ | 5.60 |  | 4 years | ​ | $ | 1,196 |  | 10 years
2018 | ​ | 236,000 | ​ | $ | 5.10 | ​ | 4 years | ​ | $ | 729 | ​ | 10 years
2019 | ​ | 160,000 | ​ | $ | 4.69 |  | 4 years | ​ | $ | 449 |  | 10 years
2019 | ​ | 80,000 | ​ | $ | 2.00 |  | 4 years | ​ | $ | 97 |  | 10 years
2020 | ​ | 196,995 | ​ | $ | 3.59 |  | 4 years | ​ | $ | 482 |  | 10 years
2020 | ​ | 760,311 | ​ | $ | 3.66 | ​ | 4 years | ​ | $ | 1,893 |  | 10 years
2020 | ​ | 129,771 | ​ | $ | 3.73 | ​ | 4 years | ​ | $ | 329 |  | 10 years
2020 | ​ | 694,073 | ​ | $ | n/a | ​ | 4 years | ​ | $ | 2,492 | ​ | 10 years
2020 | ​ | 122,656 | ​ | $ | 3.59 | ​ | 4 years | ​ | $ | 299 | ​ | 10 years
Summary of Stock Option Activity - Options Granted to Employees | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2018 | ​ | 2019 | ​ | 2020
​ |  | ​ |  | Weighted |  | ​ |  | Weighted |  | ​ |  | Weighted
​ | ​ | Number | ​ | average | ​ | Number | ​ | average | ​ | Number | ​ | average
​ | ​ | of | ​ | exercise | ​ | of | ​ | exercise | ​ | of | ​ | exercise
​ | ​ | options | ​ | price | ​ | options | ​ | price | ​ | options | ​ | price
Outstanding at beginning of year |  | 472,962 | ​ | $ | 36.04 |  | 1,000,068 | ​ | $ | 15.47 |  | 1,040,197 | ​ | $ | 13.03
Changes during the year: |  |  | ​ |  |  |  |  | ​ |  |  |  |  | ​ |  |
Granted |  | 636,000 | ​ |  | 5.41 |  | 240,000 | ​ |  | 3.79 |  | 1,209,733 | ​ |  | 3.65
Forfeited and Expired |  | 108,894 | ​ |  | 46.04 |  | 199,871 | ​ |  | 14.14 |  | 162,655 | ​ |  | 37.92
Outstanding at end of year |  | 1,000,068 | ​ | $ | 15.47 |  | 1,040,197 | ​ | $ | 13.03 |  | 2,087,275 | ​ | $ | 5.66
Exercisable at end of year |  | 394,486 | ​ | $ | 30.65 |  | 532,322 | ​ | $ | 21.04 |  | 702,889 | ​ | $ | 9.24
Summary of Restricted Stock Granted to Employees | ​
​ | ​ | ​
​ | ​ | Year Ended December 31, 2020
​ | ​ | Number of Restricted Stock
Outstanding at beginning of year | ​ | -
Changes during the year: | ​ | ​
Granted | ​ | 694,073
Vested | ​ | 69,493
Non vested at end of year | ​ | 624,580
Schedule of Options Granted to other Service Providers | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2018 | ​ | 2019 | ​ | 2020
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | Number | ​ | average | ​ | Number | ​ | average | ​ | Number | ​ | average
​ | ​ | of | ​ | exercise | ​ | of | ​ | exercise | ​ | of | ​ | exercise
​ | ​ | options | ​ | price | ​ | options | ​ | price | ​ | options | ​ | price
Outstanding at beginning of year |  | 20,000 | ​ | $ | 32.82 |  | 15,000 | ​ | $ | 33.70 |  | 15,000 | ​ | $ | 33.70
Changes during the year: |  |  | ​ |  |  |  |  | ​ |  |  |  |  | ​ |  |
Granted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 464,375 | ​ | ​ | 3.74
Expired |  | 5,000 | ​ |  | 30.20 |  |  | ​ |  |  |  | 15,000 | ​ |  | 33.70
Outstanding at end of year |  | 15,000 | ​ |  | 33.70 |  | 15,000 | ​ |  | 33.70 |  | 464,375 | ​ |  | 3.74
Exercisable at end of year |  | 15,000 | ​ | $ | 33.70 |  | 15,000 | ​ | $ | 33.70 |  | 106,875 | ​ | $ | 4.08
Schedule of warrants issued to shareholders | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2020
​ | ​ | Number of | ​ | ​ | ​
​ | ​ | warrants | ​ | ​ | Exercise price
Outstanding at beginning of year | ​ | - | ​ | ​ | ​
Changes during the year: | ​ | ​ | ​ | ​ | ​
Granted | ​ | 17,604,423 | ​ | $ | 2.36
Exercised | ​ | 200,000 | ​ | $ | 2.36
Outstanding at end of year | ​ | 17,404,423 | ​ | $ | 2.36
Schedule of Information about Share Options Outstanding and exercisable |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | 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
$2.00 |  | 80,000 |  | 8.73 |  | 25,000 |  | 8.73
$3.55 | ​ | 200,000 | ​ | 9.06 | ​ | 37,500 | ​ | 9.06
$3.59 | ​ | 319,651 | ​ | 9.51 | ​ | 32,290 | ​ | 9.48
$3.66 | ​ | 760,311 | ​ | 9.47 | ​ | 95,039 | ​ | 9.47
$3.70 | ​ | 240,000 | ​ | 9.10 | ​ | 45,000 | ​ | 9.10
$3.73 | ​ | 129,771 | ​ | 9.52 | ​ | 8,111 | ​ | 9.52
$4.69 |  | 160,000 |  | 8.50 |  | 60,000 |  | 8.50
$5.10 |  | 225,342 |  | 7.68 |  | 127,124 |  | 7.66
$5.60 |  | 225,625 |  | 4.74 |  | 168,750 |  | 3.74
$17.20 |  | 120,950 |  | 3.34 |  | 120,950 |  | 3.34
$23.70 |  | 90,000 |  | 0.83 |  | 90,000 |  | 0.83
​ |  | 2,551,650 | ​ | ​ |  | 809,764 | ​ | ​
Schedule of Stock-Based Compensation Expense in Statement of Operations |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(U.S. dollars in thousands) |  | 2018 |  | 2019 |  | 2020
Research and development expenses | ​ | $ | 310 | ​ | $ | 513 | ​ | $ | 1,036
Selling, general and administrative expenses | ​ |  | 204 | ​ |  | 322 | ​ |  | 2,090
​ | ​ | $ | 514 | ​ | $ | 835 | ​ | $ | 3,126

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