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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2020, and September 30, 2019:
Three Months EndedNine Months Ended
(In thousands)September 30,
2020		September 30,
2019		September 30,
2020		September 30,
2019
Cost of revenues$602 $280 $1,250 $824 
Research and development2,976 1,893 7,436 5,669 
Sales and marketing1,900 1,211 4,550 3,413 
General and administrative3,880 1,722 8,813 5,103 
Total stock-based compensation expense$9,358 $5,106 $22,049 $15,009 
Summary of Option Activity Under the Plans
A summary of stock options outstanding as of September 30, 2020, 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, 2020335 $19.44 
Granted— — 
Exercised(198)$18.87 
Forfeited or expired— — 
Outstanding at September 30, 2020137 $20.27 1.21$4,795 
Vested and exercisable at September 30, 2020137 1.21$4,795 
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, 2020, and activity during the nine months then ended, is presented below:
Shares
(In thousands)		Weighted- Average Grant Date Fair Value Per ShareWeighted-Average Remaining Contractual Term
(In years)		Aggregate Intrinsic Value
(In thousands)
Outstanding at January 1, 2020121 $35.06 
Granted149 $46.25 
Vested(121)$35.06 
Forfeited— — 
Outstanding at September 30, 2020149 $46.21 0.25$8,235 
Outstanding and expected to vest at September 30, 2020140 0.25$7,733 
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, 2020, and activity during the nine months then ended, is presented below:
Shares
(In thousands)		Weighted- Average Grant Date Fair Value Per ShareWeighted-Average Remaining Contractual Term
(In years)		Aggregate Intrinsic Value
(In thousands)
Outstanding at January 1, 2020287 $32.03 
Granted152 $49.67 
Vested— — 
Forfeited— — 
Outstanding at September 30, 2020439 $38.14 1.25$24,345 
Outstanding and expected to vest at September 30, 2020267 1.82$14,816 
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, 2020, and activity during the nine months then ended, is presented below:
Shares
(In thousands)		Weighted- Average Grant Date Fair Value Per ShareWeighted-Average Remaining Contractual Term
(In years)		Aggregate Intrinsic Value
(In thousands)
Outstanding at January 1, 20201,719 $31.33 
Granted430 $44.48 
Vested(589)$30.16 
Forfeited(30)$36.89 
Outstanding at September 30, 20201,530 $35.37 1.66$84,733 
Outstanding and expected to vest at September 30, 20201,418 1.60$78,580