Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2024

Marketable Securities

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

	Amortized		Gross Unrealized		Gross Unrealized		Fair
	Cost		Gains		Losses		Value
	(In thousands)
March 31, 2024
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	139,787	$	14	$	(62)	$	139,739
Maturing after one year through three years		93,179		—		(275)		92,904
Total U.S. government and municipal obligations	$	232,966	$	14	$	(337)	$	232,643
Corporate debt securities
Maturing in one year or less	$	371,025	$	141	$	(142)	$	371,024
Maturing after one year through three years		105,130		65		(93)		105,102
Total corporate debt securities	$	476,155	$	206	$	(235)	$	476,126
Total marketable securities	$	709,121	$	220	$	(572)	$	708,769
	Amortized		Gross Unrealized		Gross Unrealized		Fair
	Cost		Gains		Losses		Value
	(In thousands)
December 31, 2023
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	132,459	$	143	$	(53)	$	132,549
Maturing after one year through three years		26,009		77		—		26,086
Total U.S. government and municipal obligations	$	158,468	$	220	$	(53)	$	158,635
Corporate debt securities
Maturing in one year or less	$	183,625	$	300	$	(10)	$	183,915
Maturing after one year through three years		45,977		257		—		46,234
Total corporate debt securities	$	229,602	$	557	$	(10)	$	230,149
Total marketable securities	$	388,070	$	777	$	(63)	$	388,784