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STOCK OPTIONS (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of stock options and stock awards | The status of our stock options and stock awards are summarized as follows:
| Number of options |  | Weighted average exercise price
Outstanding at December 31, 2015 | 3,131,447 |  |  | $ | 3.38 |
Granted | 810,762 |  |  | 1.87 |
Exercised | (36,250 | ) |  | 3.62 |
Canceled and forfeited | (153,750 | ) |  | 3.69 |
Outstanding at December 31, 2016 | 3,752,209 |  |  | $ | 3.04 |
Granted | 1,728,000 |  |  | 3.09 |
Exercised | (176,750 | ) |  | 2.41 |
Canceled and forfeited | (443,302 | ) |  | 3.95 |
Outstanding at December 31, 2017 | 4,860,157 |  |  | $ | 3.00 |
Granted | 225,000 |  |  | 2.40 |
Exercised | (1,378,615 | ) |  | 2.43 |
Canceled and forfeited | (225,841 | ) |  | 2.10 |
Outstanding at December 31, 2018 | 3,480,701 |  |  | $ | 3.10 |
Exercisable at December 31, 2018 | 2,129,581 |  |  | $ | 3.20 |
Number of weighted average grant-date fair values of options |
| Number of options |  | Weighted average grant date fair value
Non-vested at December 31, 2017 | 2,232,435 |  |  | $ | 1.40 |
Granted | 225,000 |  |  | 2.40 |
Vested | (880,474 | ) |  | 1.63 |
Forfeited | (225,841 | ) |  | 2.10 |
Non-vested at December 31, 2018 | 1,351,120 |  |  | $ | 1.48 |
Schedule of option fair value assumptions |
| 2018 Grants |  | 2017 Grants |  | 2016 Grants
Option value | $1.46 | - | $3.04 |  | $1.73 | - | $2.34 |  | $0.80 | - | $0.91
Risk-free rate | 1.9% | - | 2.5% |  | 1.5% | - | 1.9% |  | 1.5% |  | 1.8%
Expected dividend yield | —% |  | —% |  | —%
Expected volatility | 60.9% | - | 68.8% |  | 62.1% | - | 68.0% |  | 49.5% | - | 50.3%
Expected term (in years) | 6 |  | 6 |  | 6
Allocation of stock based compensation | Allocation of stock based compensation from continuing operations expense was as follows:
| Year Ended December 31,
(In thousands) | 2018 |  | 2017 |  | 2016
Cost of sales | $ | — |  |  | $ | — |  |  | $ | 2 |
Research and development | 25 |  |  | 27 |  |  | 27 |
Salaries and related costs | 1,500 |  |  | 844 |  |  | 780 |
Total | $ | 1,525 |  |  | $ | 871 |  |  | $ | 809 |

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