Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Marketable Securities

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

	Gross Unrealized
	Amortized						Fair
	Cost		Gains		Losses		Value
	(In thousands)
March 31, 2022
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	148,739	$	2	$	(1,194)	$	147,547
Maturing after one year through three years		—		—		—		—
Total U.S. government and municipal obligations	$	148,739	$	2	$	(1,194)	$	147,547
Corporate debt securities
Maturing in one year or less	$	177,807	$	—	$	(602)	$	177,205
Maturing after one year through three years		31,114		—		(691)		30,423
Total corporate debt securities	$	208,921	$	—	$	(1,293)	$	207,628
Total marketable securities	$	357,660	$	2	$	(2,487)	$	355,175
	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