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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [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, 2019, and June 30, 2018:
 
Three Months Ended
 
Six Months Ended
(In thousands)
June 30,
2019
 
June 30,
2018
 
June 30,
2019
 
June 30,
2018
Cost of revenues
$
273

 
$
292

 
$
544

 
$
541

Research and development
2,144

 
2,271

 
3,776

 
4,110

Sales and marketing
1,141

 
1,126

 
2,202

 
2,402

General and administrative
1,938

 
2,426

 
3,381

 
4,687

Total stock-based compensation expense
$
5,496

 
$
6,115

 
$
9,903

 
$
11,740
Summary of Option Activity Under the Plans
A summary of stock options outstanding as of June 30, 2019, 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, 2019
335

 
$
32.41

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(128
)
 
$
23.18

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at June 30, 2019
207

 
$
38.11

 
1.57
 
$
8,727

Vested and exercisable at June 30, 2019
207

 
 
 
1.57
 
$
8,727
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, 2019, 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, 2019
26

 
$
62.87

 
 
 
 
Granted
92

 
$
70.08

 
 
 
 
Vested
(26
)
 
$
62.87

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at June 30, 2019
92

 
$
70.08

 
0.50
 
$
7,406

Outstanding and expected to vest at June 30, 2019
42

 
 
 
0.50
 
$
3,340
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, 2019, 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, 2019
213

 
$
55.48

 
 
 
 
Granted
72

 
$
68.17

 
 
 
 
Vested
(70
)
 
$
43.26

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at June 30, 2019
215

 
$
63.70

 
1.50
 
$
17,223

Outstanding and expected to vest at June 30, 2019
86

 
 
 
2.29
 
$
6,920
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, 2019, 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, 2019
895

 
$
58.19

 
 
 
 
Granted
263

 
$
68.37

 
 
 
 
Vested
(290
)
 
$
56.15

 
 
 
 
Forfeited
(12
)
 
$
60.25

 
 
 
 
Outstanding at June 30, 2019
856

 
$
61.98

 
2.06
 
$
68,664

Outstanding and expected to vest at June 30, 2019
780

 
 
 
1.97
 
$
62,565