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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 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 nine months ended September 30, 2019, and September 30, 2018:

	Three Months Ended								Nine Months Ended
(In thousands)	September 30, 2019				September 30, 2018				September 30, 2019				September 30, 2018
Cost of revenues	$	280			$	243			$	824			$	784
Research and development	1,893				1,634				5,669				5,744
Sales and marketing	1,211				1,105				3,413				3,507
General and administrative	1,722				1,416				5,103				6,103
Total stock-based compensation expense	$	5,106			$	4,398			$	15,009			$	16,138

Summary of Option Activity Under the Plans

A summary of stock options outstanding as of September 30, 2019, 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, 2019	335			$	32.41
Granted	—			—
Exercised	(162	)		$	25.51
Forfeited or expired	—			—
Outstanding at September 30, 2019	173			$	38.85			1.51		$	8,945
Vested and exercisable at September 30, 2019	173							1.51		$	8,945

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, 2019, 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, 2019	26			$	62.87
Granted	92			$	70.08
Vested	(26	)		$	62.87
Forfeited	—			—
Outstanding at September 30, 2019	92			$	70.08			0.25		$	8,353
Outstanding and expected to vest at September 30, 2019	34							0.25		$	3,141

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, 2019, 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, 2019	213			$	55.48
Granted	72			$	68.17
Vested	(70	)		$	43.26
Forfeited	—			—
Outstanding at September 30, 2019	215			$	63.70			1.25		$	19,424
Outstanding and expected to vest at September 30, 2019	58							2.25		$	5,274

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, 2019, 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, 2019	895			$	58.19
Granted	275			$	68.88
Vested	(295	)		$	56.15
Forfeited	(19	)		$	62.32
Outstanding at September 30, 2019	856			$	62.24			1.81		$	77,414
Outstanding and expected to vest at September 30, 2019	789							1.72		$	71,347

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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