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SHARE CAPITAL (Tables) | 6 Months Ended
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Jun. 30, 2021
Stockholders' Equity Note [Abstract] |
Schedule of Share Based Compensation by Share Based Payment Award Grants in Period | In the six months ended June 30, 2021 and 2020, the Company granted options and RSU as follows:
| Six months ended June 30, 2021 |  |
| Award amount* |  | Exercise price range* |  | Vesting period |  | Expiration
Employees and Directors: |  |  |  |  |  |  |
Options | 957,682 |  |  | $5.02-$11.08 |  | 1 year -4 years |  | 10 years
RSUs | 366,678 |  |  | — |  |  | 1 year -4 years |  | — |
| Six months ended June 30, 2020 |  |
| Award amount* |  | Exercise price range* |  | Vesting period |  | Expiration
Employees and Directors: |  |  |  |  |  |  |
Options | 1,195,611 |  |  | $7.80-$12.52 |  | 1 year -4 years |  | 10 years
RSUs | 647,427 |  |  | — |  |  | 1 year -4 years |  | — |
* All amounts and exercise prices for pre-Merger grants are presented following the exchange to Menlo options and RSUs at the Exchange Ratio described in Note 3-Business Combination.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of options granted was computed using the Black-Scholes model. The underlying data used for computing the fair value of the options are as follows:
| Six months ended June 30
| 2021 |  | 2020
Dividend yield | 0 | % |  | 0 | %
Expected volatility | 68.38%-69.12% |  | 60.44%-69.83%
Risk-free interest rate | 0.5%-1.07% |  | 0.44%-1.26%
Expected term | 6 years |  | 6 years
Share-based Payment Arrangement, Expensed and Capitalized, Amount | The following table illustrates the effect of share-based compensation on the statements of operations:
| Three months ended June 30 |  | Six months ended June 30
(in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Research and development expenses | $ | 442 |  |  | $ | 3,050 |  |  | $ | 900 |  |  | $ | 3,566 |
Selling, general and administrative | 1,459 |  |  | 7,718 |  |  | 3,443 |  |  | 8,961 |
Total | $ | 1,901 |  |  | $ | 10,768 |  |  | $ | 4,343 |  |  | $ | 12,527 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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