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Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Stock Option Activity | A summary of the stock option activity for the year ended December 31, 2018 is as follows:
|  |  |  | Weighted Average
| Number of Options |  | Exercise Price
Options outstanding as of December 31, 2017 | 3,330,953 |  |  | $ | 31.53
Granted | 135,000 |  |  |  | 21.63
Exercised | (152,628 | ) |  |  | 19.65
Forfeited | (761,582 | ) |  |  | 34.54
Options outstanding as of December 31, 2018 | 2,551,743 |  |  | $ | 30.82
Options exercisable as of December 31, 2018 | 1,556,519 |  |  | $ | 36.96
Schedule of Stock Options Outstanding | The following table summarizes information about stock options outstanding at December 31, 2018:
|  |  |  |  |  |  |  | Options Outstanding |  | Options Exercisable
|  |  |  |  |  |  |  | Outstanding |  | Weighted- Average |  |  |  |  | Exercisable |  |  |
|  |  |  |  |  |  |  | options at |  | Remaining |  | Weighted- Average |  | options at |  | Weighted- Average
Range of |  | December 31, |  | Contractual |  | Exercise |  | December 31, |  | Exercise
Exercise Prices |  | 2018 |  | Life in Years |  | Price |  | 2018 |  | Price
$ | 2.74 |  | - |  | $ | 19.59 |  |  | 34,810 |  |  | 8.93 |  | $ | 17.86 |  | $ | 22,309 |  | $ | 16.89
$ | 19.66 |  | - |  | $ | 19.66 |  |  | 1,056,722 |  |  | 8.05 |  |  | 19.66 |  |  | 452,620 |  |  | 19.66
$ | 19.96 |  | - |  | $ | 23.41 |  |  | 705,283 |  |  | 7.05 |  |  | 21.91 |  |  | 394,269 |  |  | 21.99
$ | 24.66 |  | - |  | $ | 120.51 |  |  | 754,928 |  |  | 5.13 |  |  | 55.36 |  |  | 687,321 |  |  | 57.60
|  |  |  |  |  |  |  |  | 2,551,743 |  |  | 6.92 |  | $ | 30.82 |  |  | 1,556,519 |  | $ | 36.96
Aggregate intrinsic value (U.S. $ in thousands) | $ | 53 |  |  |  |  |  |  |  | $ | 53
Schedule of Stock Option Assumptions | The following assumptions were applied in determining the options’ fair value on their grant date:
| 2018 |  | 2017 |  | 2016
Risk-free interest rate | 2.9%-3.1% |  | 1.8%-2.2% |  | 1.1% - 1.5%
Expected option term (years) | 5.3-5.5 |  | 5.1-6.0 |  |  | 5.2-6.0
Expected share price volatility | 52.0%-52.2% |  | 52.6%-54.0% |  | 53.6%-56.1%
Dividend yield |  | - |  |  | - |  |  | -
Weighted average grant date fair value | $ | 11.49 |  | $ | 11.10 |  | $ | 12.39
Summary of RSUs and PSUs Activity | A summary of the Company’s RSUs and PSUs activity for the year ended December 31, 2018 is as follows:
|  |  |  | Weighted Average
| Number of RSUs and PSUs |  | Grant Date Fair Value
Unvested as of December 31, 2017 | 302,163 |  |  | $ | 30.88
Granted | 1,357,825 |  |  |  | 19.75
Vested | (97,591 | ) |  |  | 43.67
Forfeited | (139,510 | ) |  |  | 22.85
Unvested as of December 31, 2018 | 1,422,887 |  |  | $ | 20.17
Schedule of Stock-based Compensation Expense | Stock-based compensation expense for stock options, RSUs and PSUs included in the Company’s Statements of Operations and Comprehensive Loss were allocated as follows:
|  | 2018 |  | 2017 |  | 2016
|  |  |  | (U.S. $ in thousands) |  |
Cost of sales |  | $ | 1,474 |  | $ | 2,580 |  | $ | 2,780
Research and development, net |  |  | 3,215 |  |  | 3,503 |  |  | 4,768
Selling, general and administrative |  |  | 10,997 |  |  | 11,639 |  |  | 13,225
Total stock-based compensation expenses |  | $ | 15,686 |  | $ | 17,722 |  | $ | 20,773
Schedule of Accumulated Other Comprehensive Loss | The following tables present the changes in the components of accumulated other comprehensive loss, net of taxes for the years ended December 31, 2018, 2017 and 2016:
|  | Year ended December 31, 2018
|  | Net unrealized gain |  | Foreign currency |  |
|  | (loss) on cash flow |  | translation |  |
|  | hedges |  | adjustments |  | Total
|  |  |  | U.S. $ in thousands |  |
Balance as of January 1, 2018 |  | $ | 330 |  |  | $ | (7,353 | ) |  | $ | (7,023 | )
Other comprehensive loss before reclassifications |  |  | (1,814 | ) |  |  | (2,691 | ) |  |  | (4,505 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | 857 |  |  |  | 2,918 |  |  |  | 3,775 |
Other comprehensive income (loss) |  |  | (957 | ) |  |  | 227 |  |  |  | (730 | )
Balance as of December 31, 2018 |  | $ | (627 | ) |  | $ | (7,126 | ) |  | $ | (7,753 | )
|  | Year ended December 31, 2017
|  | Net unrealized gain |  | Foreign currency |  |
|  | (loss) on cash flow |  | translation |  |
|  | hedges |  | adjustments |  | Total
|  |  |  |  |  | U.S. $ in thousands |  |  |  |
Balance as of January 1, 2017 |  | $ | (24 | ) |  | $ | (13,455 | ) |  | $ | (13,479 | )
Other comprehensive loss before reclassifications |  |  | 1,315 |  |  |  | 5,834 |  |  |  | 7,149 |
Amounts reclassified from accumulated other comprehensive loss |  |  | (961 | ) |  |  | 268 |  |  |  | (693 | )
Other comprehensive income (loss) |  |  | 354 |  |  |  | 6,102 |  |  |  | 6,456 |
Balance as of December 31, 2017 |  | $ | 330 |  |  | $ | (7,353 | ) |  | $ | (7,023 | )
|  | Year ended December 31, 2016
|  | Net unrealized gain |  | Foreign currency |  |  |  |
|  | (loss) on cash flow |  | translation |  |  |  |
|  | hedges |  | adjustments |  | Total
|  |  |  | U.S. $ in thousands |  |
Balance as of January 1, 2016 |  | $ | (107 | ) |  | $ | (10,667 | ) |  | $ | (10,774 | )
Other comprehensive loss before reclassifications |  |  | 523 |  |  |  | (2,788 | ) |  |  | (2,265 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | (440 | ) |  |  | - |  |  |  | (440 | )
Other comprehensive income (loss) |  |  | 83 |  |  |  | (2,788 | ) |  |  | (2,705 | )
Balance as of December 31, 2016 |  | $ | (24 | ) |  | $ | (13,455 | ) |  | $ | (13,479 | )

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