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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2020
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 months ended March 31, 2020, and March 31, 2019:
 
Three Months Ended
(In thousands)
March 31, 2020
 
March 31, 2019
Cost of revenues
$
396

 
$
271

Research and development
2,109

 
1,632

Sales and marketing
1,392

 
1,061

General and administrative
2,813

 
1,443

Total stock-based compensation expense
$
6,710

 
$
4,407
Summary of Option Activity Under the Plans
A summary of stock options outstanding as of March 31, 2020, 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, 2020
167

 
$
38.88

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(67
)
 
$
38.07

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at March 31, 2020
100

 
$
39.42

 
1.50
 
$
4,893

Vested and exercisable at March 31, 2020
100

 
 
 
1.50
 
$
4,893
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, 2020, 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, 2020
61

 
$
70.11

 
 
 
 
Granted
42

 
$
100.23

 
 
 
 
Vested
(61
)
 
$
70.11

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at March 31, 2020
42

 
$
100.23

 
0.75
 
$
3,728

Outstanding and expected to vest at March 31, 2020
42

 
 
 
0.75
 
$
3,728
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, 2020, 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, 2020
144

 
$
64.05

 
 
 
 
Granted
73

 
$
98.75

 
 
 
 
Vested
—

 
—

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at March 31, 2020
217

 
$
75.70

 
1.75
 
$
19,097

Outstanding and expected to vest at March 31, 2020
131

 
 
 
2.30
 
$
11,564
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, 2020, 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, 2020
860

 
$
62.66

 
 
 
 
Granted
70

 
$
97.97

 
 
 
 
Vested
(117
)
 
$
58.12

 
 
 
 
Forfeited
(3
)
 
$
64.40

 
 
 
 
Outstanding at March 31, 2020
810

 
$
66.39

 
2.02
 
$
71,528

Outstanding and expected to vest at March 31, 2020
752

 
 
 
1.55
 
$
66,443