MARKETABLE SECURITITES (Tables)

3 Months Ended

Mar. 31, 2019

Marketable Securities [Abstract]

Available-for-sale Securities

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at March 31, 2019, were as follows:

	Amortized Cost		Gross Unrealized					Estimated Fair Market Value
(In thousands)			Gains		Losses
Investments due in 3 months or less:
Corporate securities	$	12,635	$	—	$	(9	)	$	12,626
Total	12,635		—		(9		)	12,626
Investments due in 4-12 months:
Corporate securities	60,573		53		(60		)	60,566
Total	60,573		53		(60		)	60,566
Investments due in 12 months or greater:
Corporate securities	19,625		84		—			19,709
Total	19,625		84		—			19,709
Total marketable securities	$	92,833	$	137	$	(69	)	$	92,901

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2018, were as follows:

	Amortized Cost		Gross Unrealized					Estimated Fair Market Value
(In thousands)			Gains		Losses
Investments due in 3 months or less:
Corporate securities	$	6,788	$	—	$	(2	)	$	6,786
Total	6,788		—		(2		)	6,786
Investments due in 4-12 months:
Corporate securities	60,123		—		(244		)	59,879
Total	60,123		—		(244		)	59,879
Investments due in 12 months or greater:
Corporate securities	27,806		2		(22		)	27,786
Total	27,806		2		(22		)	27,786
Total marketable securities	$	94,717	$	2	$	(268	)	$	94,451