Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2022

Marketable Securities

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

	Gross Unrealized
	Amortized						Fair
	Cost		Gains		Losses		Value
	(In thousands)
September 30, 2022
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	132,422	$	—	$	(1,042)	$	131,380
Maturing after one year through three years		3,912		—		(71)		3,841
Total U.S. government and municipal obligations	$	136,334	$	—	$	(1,113)	$	135,221
Corporate debt securities
Maturing in one year or less	$	168,698	$	—	$	(1,548)	$	167,150
Maturing after one year through three years		2,564		—		(47)		2,517
Total corporate debt securities	$	171,262	$	—	$	(1,595)	$	169,667
Total marketable securities	$	307,596	$	—	$	(2,708)	$	304,888
	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