MARKETABLE SECURITITES

9 Months Ended

Sep. 30, 2018

Marketable Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure

MARKETABLE SECURITIES:

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at September 30, 2018, were as follows:

	Amortized Cost		Gross Unrealized					Estimated Fair Market Value
(In thousands)			Gains		Losses
Investments due in 3 months or less:
Commercial paper	$	5,687	$	—	$	—		$	5,687
Corporate securities	4,351		—		(2		)	4,349
Total	10,038		—		(2		)	10,036
Investments due in 4-12 months:
Corporate securities	65,942		—		(250		)	65,692
Total	65,942		—		(250		)	65,692
Investments due in 12 months or greater:
Corporate securities	24,060		—		(22		)	24,038
Total	24,060		—		(22		)	24,038
Total marketable securities	$	100,040	$	—	$	(274	)	$	99,766

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2017, were as follows:

	Amortized Cost		Gross Unrealized					Estimated Fair Market Value
(In thousands)			Gains		Losses
Investments due in 3 months or less:
Corporate securities	$	38,485	$	—	$	(16	)	$	38,469
Total	38,485		—		(16		)	38,469
Investments due in 4-12 months:
Corporate securities	104,440		—		(199		)	104,241
Government securities	9,302		—		(17		)	9,285
Total	113,742		—		(216		)	113,526
Investments due in 12 months or greater:
Corporate securities	37,436		—		(195		)	37,241
Total	37,436		—		(195		)	37,241
Total marketable securities	$	189,663	$	—	$	(427	)	$	189,236

As of September 30, 2018, and December 31, 2017, the Company evaluated the nature of the investments with a loss position, which were primarily high-quality corporate securities, and determined the unrealized losses were not other-than-temporary.