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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2018
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 months ended March 31, 2018, and March 31, 2017:
 
Three Months Ended
 
March 31,
(In thousands)
2018

2017
Cost of revenues
$
249

 
$
143

Research and development
1,839

 
1,634

Sales and marketing
1,276

 
1,097

General and administrative
2,261

 
2,095

Total stock-based compensation expense
$
5,625

 
$
4,969
Summary of Option Activity Under the Plans
A summary of stock options outstanding as of March 31, 2018, and activity during the three 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, 2018
511

 
$
29.03

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(84
)
 
$
23.32

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at March 31, 2018
427

 
$
30.16

 
1.98
 
$
16,312

Vested and exercisable at March 31, 2018
427

 
 
 
1.98
 
$
16,312
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 March 31, 2018, and activity during the three 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, 2018
79

 
$
63.99

 
 
 
 
Granted
56

 
$
61.12

 
 
 
 
Vested
(79
)
 
$
63.99

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at March 31, 2018
56

 
$
61.12

 
0.75
 
$
3,841

Outstanding and expected to vest at March 31, 2018
23

 
 
 
0.75
 
$
1,576
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 March 31, 2018, and activity during the three 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, 2018
184

 
$
52.80

 
 
 
 
Granted
72

 
$
59.90

 
 
 
 
Vested
(38
)
 
$
52.45

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at March 31, 2018
218

 
$
55.20

 
1.74
 
$
14,873

Outstanding and expected to vest at March 31, 2018
214

 
 
 
1.70
 
$
14,631
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 March 31, 2018, and activity during the three 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, 2018
948

 
$
55.51

 
 
 
 
Granted
117

 
$
60.03

 
 
 
 
Vested
(99
)
 
$
53.40

 
 
 
 
Forfeited
(3
)
 
$
56.42

 
 
 
 
Outstanding at March 31, 2018
963

 
$
56.27

 
2.40
 
$
65,787

Outstanding and expected to vest at March 31, 2018
880

 
 
 
1.86
 
$
60,173