Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2023

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 September 30, 2023, and December 31, 2022:

	September 30, 2023
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Short-term AFS securities
Corporate debt securities	$	119,854	$	—	$	(3,089)	$	116,765
U.S. Treasury securities	35,673		—		(562)		35,111
U.S. governmental agency securities	11,000		—		(139)		10,861
Total short-term AFS securities	$	166,527	$	—	$	(3,790)	$	162,737
Long-term AFS securities
U.S. Treasury securities	$	126,739	$	5	$	(1,026)	$	125,718
Corporate debt securities	59,542		7		(525)		59,024
U.S. governmental agency securities	4,828		—		(116)		4,712
Total long-term AFS securities	$	191,109	$	12	$	(1,667)	$	189,454

	December 31, 2022
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Short-term AFS securities
Corporate debt securities	$	52,315	$	—	$	(1,286)	$	51,029
U.S. Treasury securities	45,096		—		(963)		44,133
U.S. governmental agency securities	22,806		—		(722)		22,084
Municipal securities	8,903		—		(177)		8,726
Total short-term AFS securities	$	129,120	$	—	$	(3,148)	$	125,972
Long-term AFS securities
U.S. Treasury securities	$	25,990	$	—	$	(1,576)	$	24,414
Corporate debt securities	115,207		—		(6,377)		108,830
U.S. governmental agency securities	5,999		—		(326)		5,673
Total long-term AFS securities	$	147,196	$	—	$	(8,279)	$	138,917

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

The following tables represent the AFS securities as of September 30, 2023, and December 31, 2022, 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:

	September 30, 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
Corporate debt securities	$	11,288	$	(37)	$	105,476	$	(3,052)	$	116,764	$	(3,089)
U.S. Treasury securities	7,361		(6)		33,518		(992)		40,879		(998)
U.S. governmental agency securities	—		—		10,861		(139)		10,861		(139)
Total short-term AFS securities	$	18,649	$	(43)	$	149,855	$	(4,183)	$	168,504	$	(4,226)
Long-term AFS securities
U.S. Treasury securities	$	103,039	$	(488)	$	2,188	$	(103)	$	105,227	$	(591)
Corporate debt securities	48,226		(224)		5,891		(301)		54,117		(525)
U.S. governmental agency securities	3,762		(66)		950		(49)		4,712		(115)
Total long-term AFS securities	$	155,027	$	(778)	$	9,029	$	(453)	$	164,056	$	(1,231)

	December 31, 2022
	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
Corporate debt securities	$	3,799	$	(11)	$	47,230	$	(1,275)	$	51,029	$	(1,286)
U.S. Treasury securities	—		—		44,133		(963)		44,133		(963)
U.S. governmental agency securities	—		—		22,084		(722)		22,084		(722)
Municipal securities	—		—		8,726		(177)		8,726		(177)
Total short-term AFS securities	$	3,799	$	(11)	$	122,173	$	(3,137)	$	125,972	$	(3,148)
Long-term AFS securities
U.S. Treasury securities	$	282	$	(9)	$	24,132	$	(1,567)	$	24,414	$	(1,576)
Corporate debt securities	2,004		(57)		106,826		(6,320)		108,830		(6,377)
U.S. governmental agency securities	—		—		5,673		(326)		5,673		(326)
Total long-term AFS securities	$	2,286	$	(66)	$	136,631	$	(8,213)	$	138,917	$	(8,279)