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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2018, and September 30, 2017:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(In thousands)
2018

2017
 
2018
 
2017
Cost of revenues
$
243

 
$
391

 
$
784

 
$
885

Research and development
1,634

 
2,173

 
5,744

 
6,158

Sales and marketing
1,105

 
1,441

 
3,507

 
3,727

General and administrative
1,416

 
2,521

 
6,103

 
7,052

Total stock-based compensation expense
$
4,398

 
$
6,526

 
$
16,138

 
$
17,822
Summary of Option Activity Under the Plans
A summary of stock options outstanding as of September 30, 2018, 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, 2018
511

 
$
29.03

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(136
)
 
$
23.31

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at September 30, 2018
375

 
$
31.11

 
1.64
 
$
12,036

Vested and exercisable at September 30, 2018
375

 
 
 
1.64
 
$
12,036
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, 2018, 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, 2018
79

 
$
63.99

 
 
 
 
Granted
89

 
$
62.87

 
 
 
 
Vested
(79
)
 
$
63.99

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at September 30, 2018
89

 
$
62.87

 
0.25
 
$
5,588

Outstanding and expected to vest at September 30, 2018
27

 
 
 
0.25
 
$
1,677
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, 2018, 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, 2018
184

 
$
52.80

 
 
 
 
Granted
72

 
$
59.90

 
 
 
 
Vested
(38
)
 
$
52.45

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at September 30, 2018
218

 
$
55.20

 
1.24
 
$
13,752

Outstanding and expected to vest at September 30, 2018
161

 
 
 
1.01
 
$
10,144
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, 2018, 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, 2018
948

 
$
55.51

 
 
 
 
Granted
268

 
$
62.96

 
 
 
 
Vested
(288
)
 
$
53.77

 
 
 
 
Forfeited
(23
)
 
$
59.39

 
 
 
 
Outstanding at September 30, 2018
905

 
$
58.17

 
1.98
 
$
57,200

Outstanding and expected to vest at September 30, 2018
828

 
 
 
1.86
 
$
52,347