Investments in Available-for-Sale Securities (Tables)

12 Months Ended

Dec. 31, 2019

Debt Securities, Available-for-sale [Abstract]

Available-for-sale Securities

The Company’s investments in available-for-sale marketable securities are as follows:

	December 31, 2019
										Balance Sheet
			Gross		Gross					Classification
			Unrealized		Unrealized			Fair		Short-Term
	Cost Basis		Gains		Losses			Value		Investments
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	35,044	$	1	$	(16	)	$	35,029	$	35,029
Corporate notes and bonds	100,643		200		(205		)	100,638		100,638
Total Investments	$	135,687	$	201	$	(221	)	$	135,667	$	135,667

	December 31, 2018
										Balance Sheet
			Gross		Gross					Classification
			Unrealized		Unrealized			Fair		Short-Term
	Cost Basis		Gains		Losses			Value		Investments
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	100,003	$	11	$	(126	)	$	99,888	$	99,888
Corporate notes and bonds	63,137		4		(232		)	62,909		62,909
Total Investments	$	163,140	$	15	$	(358	)	$	162,797	$	162,797