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SHAREHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Note [Abstract] |
Schedule of Share Option Activity |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | Number of share options |  |  | Weighted average exercise price |  |  | Number of share options |  |  | Weighted average exercise price |  |  | Number of share options |  |  | Weighted average exercise price |
Outstanding as of beginning of year |  |  | 580,185 |  |  | $ | 9.64 |  |  |  | 2,278,089 |  |  | $ | 9.92 |  |  |  | 5,878,270 |  |  | $ | 6.84 |
Granted |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | 207,890 |  |  |  | 12.19 |
Exercised |  |  | (70,271 | ) |  |  | 10.19 |  |  |  | (1,611,489 | ) |  |  | 9.27 |  |  |  | (3,649,754 | ) |  |  | 4.82 |
Terminated |  |  | (921 | ) |  |  | 9.82 |  |  |  | (77,292 | ) |  |  | 25.89 |  |  |  | (97,063 | ) |  |  | 21.34 |
Forfeited |  |  | (500 | ) |  |  | 4.42 |  |  |  | (9,123 | ) |  |  | 8.06 |  |  |  | (61,254 | ) |  |  | 7.25 |
Outstanding as of end of year |  |  | 508,493 |  |  |  | 9.58 |  |  |  | 580,185 |  |  |  | 9.64 |  |  |  | 2,278,089 |  |  |  | 9.92 |
Options exercisable as of end of year |  |  | 485,579 |  |  | $ | 9.46 |  |  |  | 459,662 |  |  | $ | 8.51 |  |  |  | 1,606,983 |  |  | $ | 10.19 |
Schedule of Restricted Shares Units Activity |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | Number of RSU |  |  | Weighted Average Fair Value |  |  | Number of RSU |  |  | Weighted Average Fair Value |  |  | Number of RSU |  |  | Weighted Average Fair Value |
Outstanding as of beginning of year |  |  | 1,245,889 |  |  | $ | 21.29 |  |  |  | 1,009,184 |  |  | $ | 14.62 |  |  |  | 773,200 |  |  | $ | 15.11 |
Granted |  |  | 977,667 |  |  |  | 20.80 |  |  |  | 818,856 |  |  |  | 24.88 |  |  |  | 359,643 |  |  |  | 12.83 |
Converted |  |  | (602,423 | ) |  |  | 17.86 |  |  |  | (553,241 | ) |  |  | 14.71 |  |  |  | (86,847 | ) |  |  | 11.45 |
Forfeited |  |  | (21,837 | ) |  |  | 22.11 |  |  |  | (28,910 | ) |  |  | 16.42 |  |  |  | (36,812 | ) |  |  | 14.73 |
Outstanding as of end of year |  |  | 1,599,296 |  |  | $ | 22.27 |  |  |  | 1,245,889 |  |  | $ | 21.29 |  |  |  | 1,009,184 |  |  | $ | 14.62 |
Schedule of Information about Share Options Outstanding | The following table summarizes information about employees’ share options outstanding as of December 31, 2018:
Outstanding |  |  | Exercisable |
Range of exercise prices |  |  | Number outstanding |  |  | Weighted average remaining contractual life (in years) |  |  | Weighted average exercise price |  |  | Number exercisable |  |  | Weighted average exercise price |
$ | 4.42 - 17.25 |  |  |  | 508,493 |  |  |  | 3.08 |  |  | $ | 9.58 |  |  |  | 485,579 |  |  | $ | 9.46 |
Schedule of Intrinsic and Fair Values for Options Exercised |
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
The intrinsic value of options exercised |  | $ | 1,416 |  |  | $ | 26,031 |  |  | $ | 40,314 |
The original fair value of options exercised |  | $ | 302 |  |  | $ | 7,202 |  |  | $ | 16,711 |
Schedule of Intrinsic and Fair Values for RSU's Exercised |
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
The intrinsic value of converted RSU's |  | $ | 15,840 |  |  | $ | 12,996 |  |  | $ | 1,177 |
The original fair value of converted RSU's |  | $ | 10,761 |  |  | $ | 8,138 |  |  | $ | 994 |
Schedule of Stock-Based Compensation Expense in Statement of Operations | Stock-based compensation expenses were recognized in the Statement of Operations as follows:
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Cost of goods |  | $ | 3,141 |  |  | $ | 3,084 |  |  | $ | 3,920 |
Research and development, net |  |  | 2,533 |  |  |  | 2,555 |  |  |  | 2,119 |
Marketing, general and administrative |  |  | 6,987 |  |  |  | 6,010 |  |  |  | 3,367 |
Total stock-based compensation expense |  | $ | 12,661 |  |  | $ | 11,649 |  |  | $ | 9,406 |
Schedule of Fair Value of Options Granted |
The Company estimated the fair value, utilizing the following assumptions for the year 2016 (all in weighted averages):
|  | 2016 |
Risk-free interest rate |  |  | 0.9%-1.3% |
Expected life of options |  | 4.60 years |
Expected annual volatility |  |  | 47%-48% |
Expected dividend yield |  | None |

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