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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based Compensation Expense
The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three and nine months ended September 30, 2016, and September 30, 2015:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(In thousands)
2016

2015
 
2016
 
2015
Cost of revenues
$
348

 
$
219

 
$
731

 
$
725

Research and development
1,934

 
1,277

 
5,343

 
3,974

Sales and marketing
1,303

 
877

 
3,229

 
2,767

General and administrative
2,204

 
988

 
5,914

 
4,036

Total stock-based compensation expense
$
5,789

 
$
3,361

 
$
15,217

 
$
11,502
Summary of Option Activity Under the Plans
A summary of stock options outstanding as of September 30, 2016, and activity during the nine months then ended, is presented below:
 
Shares
(in thousands)
 
Weighted-
Average
Exercise
Price
 
Weighted-Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at January 1, 2016
1,030

 
$
27.58

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(168
)
 
$
24.83

 
 
 
 
Forfeited or expired
—

 
$
—

 
 
 
 
Outstanding at September 30, 2016
862

 
$
28.12

 
2.72
 
$
30,106

Exercisable at September 30, 2016
862

 
$
28.12

 
2.72
 
$
30,106

Vested and expected to vest at September 30, 2016
862

 
$
28.12

 
2.72
 
$
30,106
Performance Based Awards (PSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of PSUs outstanding as of September 30, 2016, and activity during the nine months then ended, is presented below:
 
Shares
(in thousands)
 
Weighted-Average
Grant Date Fair
Value Per Share
 
Weighted-Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at January 1, 2016
11

 
$
52.35

 
 
 
 
Granted
101

 
$
46.24

 
 
 
 
Vested
(11
)
 
$
52.35

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Outstanding at September 30, 2016
101

 
$
46.24

 
0.25
 
$
6,340

Outstanding and expected to vest at September 30, 2016
100

 
 
 
0.25
 
$
6,276
Long-Term Performance-Based Awards (PRSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of PRSUs outstanding as of September 30, 2016, and activity during the nine months then ended, is presented below:
 
Shares
(in thousands)
 
Weighted-Average
Grant Date Fair
Value Per Share
 
Weighted-Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at January 1, 2016
129

 
$
53.75

 
 
 
 
Granted
78

 
$
43.26

 
 
 
 
Vested
—

 
$
—

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Outstanding at September 30, 2016
207

 
$
49.78

 
1.35
 
$
13,053

Outstanding and expected to vest at September 30, 2016
113

 
 
 
1.32
 
$
7,114
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of RSUs outstanding as of September 30, 2016, and activity during the nine months then ended, is presented below:
 
Shares
(in thousands)
 
Weighted- Average
Grant Date Fair
Value Per Share
 
Weighted-Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at January 1, 2016
681

 
$
46.98

 
 
 
 
Granted
322

 
$
46.30

 
 
 
 
Vested
(259
)
 
$
45.13

 
 
 
 
Forfeited
(22
)
 
$
47.08

 
 
 
 
Outstanding at September 30, 2016
722

 
$
47.34

 
1.47
 
$
45,490

Outstanding and expected to vest at September 30, 2016
670

 
 
 
1.41
 
$
42,229