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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2018, and June 30, 2017:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(In thousands)
2018

2017
 
2018
 
2017
Cost of revenues
$
292

 
$
351

 
$
541

 
$
494

Research and development
2,271

 
2,351

 
4,110

 
3,985

Sales and marketing
1,126

 
1,189

 
2,402

 
2,286

General and administrative
2,426

 
2,436

 
4,687

 
4,531

Total stock-based compensation expense
$
6,115

 
$
6,327

 
$
11,740

 
$
11,296
Summary of Option Activity Under the Plans
A summary of stock options outstanding as of June 30, 2018, and activity during the six 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
(126
)
 
$
23.29

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at June 30, 2018
385

 
$
30.92

 
1.87
 
$
16,220

Vested and exercisable at June 30, 2018
385

 
 
 
1.87
 
$
16,220
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 June 30, 2018, and activity during the six 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
88

 
$
62.82

 
 
 
 
Vested
(79
)
 
$
63.99

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at June 30, 2018
88

 
$
62.82

 
0.50
 
$
6,458

Outstanding and expected to vest at June 30, 2018
47

 
 
 
0.50
 
$
3,398
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 June 30, 2018, and activity during the six 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 June 30, 2018
218

 
$
55.20

 
1.49
 
$
15,896

Outstanding and expected to vest at June 30, 2018
214

 
 
 
1.45
 
$
15,637
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 June 30, 2018, and activity during the six 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
251

 
$
62.31

 
 
 
 
Vested
(282
)
 
$
53.80

 
 
 
 
Forfeited
(16
)
 
$
58.66

 
 
 
 
Outstanding at June 30, 2018
901

 
$
57.88

 
2.23
 
$
65,818

Outstanding and expected to vest at June 30, 2018
815

 
 
 
2.11
 
$
59,552