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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2019

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 months ended March 31, 2019, and March 31, 2018:

	Three Months Ended
(In thousands)	March 31, 2019				March 31, 2018
Cost of revenues	$	271			$	249
Research and development	1,632				1,839
Sales and marketing	1,061				1,276
General and administrative	1,443				2,261
Total stock-based compensation expense	$	4,407			$	5,625

Summary of Option Activity Under the Plans

A summary of stock options outstanding as of March 31, 2019, 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, 2019	335			$	32.41
Granted	—			—
Exercised	(85	)		$	20.92
Forfeited or expired	—			—
Outstanding at March 31, 2019	250			$	36.33			1.73		$	8,404
Vested and exercisable at March 31, 2019	250							1.73		$	8,404

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, 2019, 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, 2019	26			$	62.87
Granted	58			$	69.46
Vested	(26	)		$	62.87
Forfeited	—			—
Outstanding at March 31, 2019	58			$	69.46			0.75		$	4,043
Outstanding and expected to vest at March 31, 2019	38							0.75		$	2,648

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, 2019, 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, 2019	213			$	55.48
Granted	72			$	68.17
Vested	(70	)		$	43.26
Forfeited	—			—
Outstanding at March 31, 2019	215			$	63.70			1.75		$	15,023
Outstanding and expected to vest at March 31, 2019	93							2.41		$	6,534

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, 2019, 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, 2019	895			$	58.19
Granted	119			$	67.51
Vested	(112	)		$	54.38
Forfeited	(4	)		$	56.81
Outstanding at March 31, 2019	898			$	59.91			2.20		$	62,796
Outstanding and expected to vest at March 31, 2019	827							1.71		$	57,871

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