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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2018
Schedule of Stock Option Activity
The following is a summary of the Company's share options granted under the Plans:
 
   
Year ended
December 31, 2018
  
   
Number
of options (thousands)
    
Weighted average exercise
price (per share)
    
Weighted- average remaining contractual term
(in years)
    
Aggregate intrinsic value (*)
  
                         
Outstanding at beginning of year
    
1,570
    
$
9.64
      
3.12
    
$
403
  
Granted
    
9
      
16.44
                  
Exercised
    
(594
)
    
10.18
                  
Forfeited
    
(18
)
    
9.54
                  
                                 
Outstanding at end of year
    
967
    
$
9.38
      
2.52
    
$
9,967
  
                                 
Exercisable at end of year
    
834
    
$
9.70
      
2.17
    
$
8,324
  

(*) Calculation of aggregate intrinsic value for options outstanding and exercisable is based on the share price of the Company’s ordinary shares as of December 31, 2018 which was $19.68 per share.
Schedule of Shares Authorized Under Stock Option Plans, by Exercise Price Range
The options outstanding as of December 31, 2018, have been separated into ranges of exercise price per share as follows:

     
Outstanding
    
Exercisable
  
Exercise price
    
 
Number
 outstanding
(thousands)
    
Weighted average
 remaining
contractual
life
(years)
    
Weighted
average
exercise
price
    
Number
exercisable
(thousands)
    
Weighted
average
remaining
contractual life
(years)
    
Weighted
average exercise
price
  
                                       
$
2.76 - $7.29
      
289
      
4.11
    
$
6.50
      
165
      
3.72
    
$
6.36
  
$
7.81-$10.03
      
292
      
1.45
      
9.17
      
292
      
1.45
      
9.17
  
$
10.06 - $11.32
      
238
      
1.69
      
10.66
      
235
      
1.67
      
10.67
  
$
11.38 - $14.68
      
142
      
2.71
      
13.05
      
142
      
2.71
      
13.05
  
$
21.13
      
6
      
5.97
      
21.13
      
-
      
-
      
-
  
                                                     
         
967
      
2.52
    
$
9.38
      
834
      
2.17
    
$
9.70
  
Schedule of RSU/PSU Activity
A summary of the Company’s RSU (excluding PSUs) activities and related information for the year ended December 31, 2018, is as follows:

   
Number of RSUs
(thousands)
    
Weighted average
grant-date fair value
  
Outstanding at January 1, 2018
    
812
    
$
8.08
  
Granted
    
603
      
9.73
  
Vested
    
(360
)
    
8.83
  
Forfeited
    
(110
)
    
7.57
  
                 
Non-vested at December 31, 2018
    
945
    
$
8.90
  
Schedule of Stock-Based Compensation Expense
The allocation of the share-based compensation is as follows:

   
Year ended
December 31,
  
   
2018
    
2017
    
2016
  
                   
Cost of maintenance and services
  
$
198
    
$
162
    
$
148
  
Research and development
    
679
      
804
      
1,098
  
Selling and marketing
    
2,521
      
1,818
      
2,011
  
General and administrative
    
1,024
      
927
      
993
  
                         
Total share-based compensation
  
$
4,422
    
$
3,711
    
$
4,250
  
PSU [Member]  
Schedule of RSU/PSU Activity
A summary of the Company’s PSU activities and related information for the year ended December 31, 2018, is as follows:

   
Number of PSUs
(thousands)
    
Weighted average
grant-date fair value
  
Outstanding at January 1, 2018
    
40
    
$
6.82
  
Granted
    
370
      
10.06
  
Vested
    
-
      
-
  
Forfeited
    
(18
)
    
7.45
  
                 
Non-vested at December 31, 2018
    
392
    
$
9.85