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SHAREHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2016
Stockholders' Equity Note [Abstract]  
Summary of Stock Option Activity
A summary of employees and directors option activity under the Company's Stock Option Plans as of December 31, 2016, 2015 and 2014 is as follows:

   
Number of options
   
Weighted-average exercise price
   
Weighted- average remaining contractual term
(in years)
   
Aggregate intrinsic value
 
                         
Outstanding at January 1, 2016
   
5,201,661
   
$
16.51
     
3.06
   
$
2,748
 
Granted
   
2,772,300
     
12.94
                 
Exercised
   
(139,400
)
   
12.18
                 
Expired
   
(416,523
)
   
17.06
                 
Forfeited
   
(1,389,150
)
   
19.09
                 
                                 
Outstanding at December 31, 2016
   
6,028,888
   
$
14.33
     
3.27
   
$
5,070
 
                                 
Exercisable at December 31, 2016
   
2,014,403
   
$
15.28
     
1.85
   
$
597
 
                                 
Vested and expected to vest at December 31, 2016
   
5,475,668
   
$
14.44
     
3.16
   
$
4,236
 
 
   
Number of options
   
Weighted-average exercise price
   
Weighted- average remaining contractual term
(in years)
   
Aggregate intrinsic value
 
                         
Outstanding at January 1, 2015
   
4,702,920
   
$
15.54
     
3.22
   
$
30,474
 
Granted
   
1,562,000
     
18.96
                 
Exercised
   
(600,393
)
   
14.57
                 
Expired
   
(160,000
)
   
16.92
                 
Forfeited
   
(302,866
)
   
17.76
                 
                                 
Outstanding at December 31, 2015
   
5,201,661
   
$
16.51
     
3.06
   
$
2,748
 
                                 
Exercisable at December 31, 2015
   
1,791,130
   
$
15.32
     
1.91
   
$
1,578
 
                                 
Vested and expected to vest at December 31, 2015
   
4,878,629
   
$
16.44
     
2.99
   
$
2,655
 
 
 
   
Number of options
   
Weighted-average exercise price
   
Weighted- average remaining contractual term
(in years)
   
Aggregate intrinsic value
 
                         
Outstanding at January 1, 2014
   
7,073,511
   
$
11.74
     
2.62
   
$
44,716
 
Granted
   
1,239,375
     
17.14
                 
Exercised
   
(3,058,966
)
   
7.35
                 
Expired
   
-
     
-
                 
Forfeited
   
(551,000
)
   
14.83
                 
                                 
Outstanding at December 31, 2014
   
4,702,920
   
$
15.54
     
3.22
   
$
30,474
 
                                 
Exercisable at December 31, 2014
   
1,265,300
   
$
15.57
     
1.58
   
$
8,161
 
                                 
Vested and expected to vest at December 31, 2014
   
4,320,142
   
$
15.99
     
3.14
   
$
26,033
 
Summary of Stock Options Outstanding by Exercise Price Range
The options outstanding under the Company's Stock Option Plans as of December 31, 2016, 2015 and 2014 have been separated into ranges of exercise price as follows:

December 31, 2016  
Outstanding
   
Exercisable
 
           
Weighted
                   
           
average
   
Weighted
         
Weighted
 
Ranges of
         
remaining
   
average
         
average
 
exercise
   
Number of
   
contractual
   
exercise
   
Number of
   
exercise
 
price
   
options
   
life (years)
   
price
   
options
   
price
 
                                 
$
10.08-14.74
     
4,190,733
     
3.66
     
13.38
     
982,890
     
13.97
 
$
15.09-19.30
     
1,793,905
     
2.37
     
16.34
     
1,031,513
     
16.52
 
$
20.62-23.66
     
44,250
     
3.47
     
22.81
     
-
     
-
 
                                             
         
6,028,888
                     
2,014,403
         
 
December 31, 2015
 
Outstanding
   
Exercisable
 
           
Weighted
                   
           
average
   
Weighted
         
Weighted
 
Ranges of
         
remaining
   
average
         
average
 
exercise
   
Number of
   
contractual
   
exercise
   
Number of
   
exercise
 
price
   
options
   
life (years)
   
price
   
options
   
price
 
                                 
$
12.18-14.74
     
1,861,208
     
2.98
     
13.91
     
863,792
     
13.56
 
$
15.09-19.30
     
2,557,703
     
2.67
     
16.69
     
927,338
     
16.96
 
$
20.62-23.66
     
782,750
     
4.53
     
22.10
     
-
     
-
 
                                             
         
5,201,661
                     
1,791,130
         
 
December 31, 2014
 
Outstanding
   
Exercisable
 
           
Weighted
                   
           
average
   
Weighted
         
Weighted
 
Ranges of
         
remaining
   
average
         
average
 
exercise
   
Number of
   
contractual
   
exercise
   
Number of
   
exercise
 
price
   
options
   
life (years)
   
price
   
options
   
price
 
                                 
$
7.65
     
60,350
     
0.25
     
7.65
     
60,350
     
7.65
 
$
11.94-14.47
     
1,861,533
     
3.32
     
13.58
     
334,200
     
12.19
 
$
15.09-19.30
     
2,781,037
     
3.21
     
17.03
     
870,750
     
17.41
 
                                             
         
4,702,920
                     
1,265,300
         


Summary of RSU Activity
The following table summarizes information relating to RSUs, as well as changes to such awards during 2016:

   
Year ended
December 31,
 
   
2016
 
   
Number in thousands
 
       
Outstanding at January 1, 2016
   
818,364
 
Granted
   
743,188
 
Vested
   
(154,633
)
Forfeited
   
(123,989
)
         
Outstanding as of December 31, 2016
   
1,282,930
 
Summary of Stock-Based Compensation Expense
Stock-based compensation was recorded in the following items within the consolidated statements of income (loss):
 
   
Year ended
December 31,
 
   
2016
   
2015
   
2014
 
                   
Cost of revenues
 
$
180
   
$
141
   
$
79
 
Research and development, net
   
3,339
     
2,456
     
1,421
 
Sales and marketing
   
5,661
     
4,098
     
2,950
 
General and administrative
   
2,340
     
2,634
     
2,932
 
                         
Total expenses
 
$
11,520
   
$
9,329
   
$
7,382