Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2022

Marketable Securities

Schedule of marketable debt securities, classified as available-for-sale

	Gross Unrealized
	Amortized						Fair
	Cost		Gains		Losses		Value
	(In thousands)
June 30, 2022
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	152,518	$	—	$	(1,494)	$	151,024
Maturing after one year through three years		3,887		—		(17)		3,870
Total U.S. government and municipal obligations	$	156,405	$	—	$	(1,511)	$	154,894
Corporate debt securities
Maturing in one year or less	$	149,304	$	—	$	(829)	$	148,475
Maturing after one year through three years		25,720		—		(673)		25,047
Total corporate debt securities	$	175,024	$	—	$	(1,502)	$	173,522
Total marketable securities	$	331,429	$	—	$	(3,013)	$	328,416
	Gross Unrealized
	Amortized						Fair
	Cost		Gains		Losses		Value
	(In thousands)
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