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SHAREHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2017
Text Block [Abstract]  
Number of Reserved and Authorized Shares Under the Equity Incentive Plans

As of December 31, 2017, the number of Reserved and Authorized Shares under the Equity Incentive Plans is as detailed below:

 

     2017  
     Number in
thousands
 

Stock Options outstanding

     13,142  

RSU outstanding

     893  

PSU outstanding

     175  

Ordinary shares available for issuance under the Equity Incentive Plans

     1,693  
  

 

 

 

Total Reserved and Authorized Shares as of December 31, 2017

     15,903  
  

 

 

 
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
 
     2017  

Outstanding at beginning of year

     12,578      $ 66.54      $ 225,384  

Granted

     2,465      $ 109.36     

Exercised

     (1,901)      $ 56.87     
  

 

 

    

 

 

    

 

 

 

Outstanding at December 31, 2017

     13,142      $ 75.97      $ 381,022  
  

 

 

    

 

 

    

 

 

 

Exercisable at December 31, 2017

     7,932      $ 66.45      $ 299,045  
  

 

 

    

 

 

    

 

 

 

Summary of Restricted Stock Units Activity

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

 

     Year ended
December 31,
 
     2017  
     Number in thousands  

Unvested at beginning of year

     937  

Granted

     397  

Vested

     (340

Forfeited

     (101
  

 

 

 

Unvested the end of the year

     893  
  

 

 

 
Summary of Performance Stock Units Activity

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

 

     Year ended
December 31,
 
     2017  
     Number in thousands  

Unvested at beginning of year

     195  

Granted

     87  

Vested

     (59

Forfeited

     (48
  

 

 

 

Unvested the end of the year

     175  
  

 

 

 
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,
 
     2017      2016      2015  

Cost of revenues

   $ 2,741      $ 2,153      $ 1,585  

Research and development

     16,233        12,718        11,544  

Selling and marketing

     18,278        19,168        16,351  

General and administrative

     50,207        48,693        46,822  
  

 

 

    

 

 

    

 

 

 
   $ 87,459      $ 82,732      $ 76,302