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SHAREHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2018
Text Block [Abstract]  
Number of Reserved and Authorized Shares Under the Equity Incentive Plans

As of December 31, 2018, the number of Reserved and Authorized Shares under the Equity Incentive Plans is as detailed below:

 

     2018   

        

       Number in  
thousands

 

Stock Options outstanding

  

 

 

 

8,542

 

 

RSU outstanding

     1,293  

PSU outstanding

     85  

Ordinary shares available for issuance under the Equity Incentive Plans

     6,610  
  

 

 

 

 

Total Reserved and Authorized Shares as of December 31, 2018

  

 

 

 

16,530

 

 

  

 

 

 

Summary of Stock Option Activity and Related Information

A summary of the Company’s stock option activity and related information is as follows:

 

       Options in  
thousands
    Weighted  
average
exercise
price
     Aggregate  
intrinsic
value
     2018

Outstanding at beginning of year

   13,142   $75.97    $381,022

Granted

   2,048   $109.26   

Exercised

   (6,041)   $59.16   

Forfeited

   (607)   $84.15   
  

 

 

 

  

 

Outstanding at December 31, 2018

   8,542   $95.26    101,203
  

 

 

 

  

 

Exercisable at December 31, 2018

   4,007   $87.37    70,507
  

 

 

 

  

 

Summary of Restricted Stock Units Activity

A summary of the Company’s RSUs activity is as follows:

 

     Year ended
December 31,
     2018
       Number in thousands  

Unvested at beginning of year

   893

Granted

   932

Vested

   (318)

Forfeited

   (214)
  

 

Unvested the end of the year

   1,293
  

 

Summary of Performance Stock Units Activity

A summary of the Company’s PSUs activity is as follows:

 

     Year ended
December 31,
     2018
       Number in thousands  

Unvested at beginning of year

   175

Vested

   (65)

Forfeited

   (25)
  

 

Unvested the end of the year

   85
  

 

Stock-based Compensation Expense Related to Stock Options, RSUs and PSUs

Stock-based compensation expense related to stock options, RSUs and PSUs is included in the consolidated statements of operations as follows (in thousands):

 

     Year ended
December 31,
     2018    2017    2016

Cost of revenues

     $ 3,545        $ 2,741        $ 2,153  

Research and development

     17,644        16,233        12,718  

Selling and marketing

     20,800        18,278        19,168  

General and administrative

     47,337        50,207        48,693  
  

 

 

 

  

 

 

 

  

 

 

 

     $     89,326        $     87,459        $     82,732