Marketable Securities

12 Months Ended

Dec. 31, 2022

Marketable Securities

Marketable Securities

(5) Marketable Securities

The following is a summary of marketable debt securities, classified as available-for-sale:

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(In thousands)
December 31, 2022
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	97,246	$	5	$	(369)	$	96,882
Maturing after one year through three years		—		—		—		—
Total U.S. government and municipal obligations	$	97,246	$	5	$	(369)	$	96,882
Corporate debt securities
Maturing in one year or less	$	179,613	$	—	$	(972)	$	178,641
Maturing after one year through three years		—		—		—		—
Total corporate debt securities	$	179,613	$	—	$	(972)	$	178,641
Total marketable securities	$	276,859	$	5	$	(1,341)	$	275,523
December 31, 2021
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	80,674	$	—	$	(133)	$	80,541
Maturing after one year through three years		51,319		—		(184)		51,135
Total U.S. government and municipal obligations	$	131,993	$	—	$	(317)	$	131,676
Corporate debt securities
Maturing in one year or less	$	170,034	$	—	$	(28)	$	170,006
Maturing after one year through three years		67,782		—		(357)		67,425
Total corporate debt securities	$	237,816	$	—	$	(385)	$	237,431
Total marketable securities	$	369,809	$	—	$	(702)	$	369,107

The Company holds investment grade marketable securities, and none were considered to be other-than-temporarily impaired as of December 31, 2022. Marketable securities include $0.8 million and $1.3 million in accrued interest at December 31, 2022 and December 31, 2021, respectively.