Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Market Value of AFS Securities

The following tables present the amortized cost, gross unrealized gains and losses, and fair market value of our AFS securities as of June 30, 2024, and December 31, 2023:

	June 30, 2024
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Short-term AFS securities
U.S. Treasury securities	$	122,999	$	1	$	(417)	$	122,583
Corporate debt securities	61,284		9		(306)		60,987
U.S. governmental agency securities	4,915		—		(49)		4,866
Total short-term AFS securities	$	189,198	$	10	$	(772)	$	188,436
Long-term AFS securities
Corporate debt securities	$	168,460	$	190	$	(384)	$	168,266
U.S. Treasury securities	144,705		39		(417)		144,327
Total long-term AFS securities	$	313,165	$	229	$	(801)	$	312,593

	December 31, 2023
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Short-term AFS securities
U.S. Treasury securities	$	48,721	$	55	$	(667)	$	48,109
Corporate debt securities	109,891		6		(1,828)		108,069
U.S. governmental agency securities	6,000		—		(84)		5,916
Total short-term AFS securities	$	164,612	$	61	$	(2,579)	$	162,094
Long-term AFS securities
Corporate debt securities	$	103,061	$	886	$	(5)	$	103,942
U.S. Treasury securities	148,878		1,023		(42)		149,859
U.S. governmental agency securities	3,857		—		(25)		3,832
Total long-term AFS securities	$	255,796	$	1,909	$	(72)	$	257,633

Schedule of Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following tables represent the AFS securities as of June 30, 2024, and December 31, 2023, that were in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position:

	June 30, 2024
	Less than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Short-term AFS securities
U.S. Treasury securities	$	81,000	$	(128)	$	34,515	$	(289)	$	115,515	$	(417)
Corporate debt securities	24,046		(50)		29,065		(256)		53,111		(306)
U.S. governmental agency securities	—		—		4,866		(49)		4,866		(49)
Total short-term AFS securities	$	105,046	$	(178)	$	68,446	$	(594)	$	173,492	$	(772)
Long-term AFS securities
Corporate debt securities	$	107,698	$	(384)	$	—	$	—	$	107,698	$	(384)
U.S. Treasury securities	101,238		(417)		—		—		101,238		(417)
Total long-term AFS securities	$	208,936	$	(801)	$	—	$	—	$	208,936	$	(801)

	December 31, 2023
	Less than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Short-term AFS securities
U.S. Treasury securities	$	995	$	(1)	$	24,978	$	(666)	$	25,973	$	(667)
Corporate debt securities	5,819		(5)		99,504		(1,823)		105,323		(1,828)
U.S. governmental agency securities	—		—		5,916		(84)		5,916		(84)
Total short-term AFS securities	$	6,814	$	(6)	$	130,398	$	(2,573)	$	137,212	$	(2,579)
Long-term AFS securities
Corporate debt securities	$	2,451	$	—	$	245	$	(5)	$	2,696	$	(5)
U.S. Treasury securities	14,792		(36)		290		(6)		15,082		(42)
U.S. governmental agency securities	3,832		(25)		—		—		3,832		(25)
Total long-term AFS securities	$	21,075	$	(61)	$	535	$	(11)	$	21,610	$	(72)