Marketable Securities - Available-for-sale Securities - Continuous Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
U.S. Treasury securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	$ 81,000	$ 995
Gross unrealized losses, less than 12 months, short-term AFS securities	(128)	(1)
Fair value, 12 months or greater, short-term AFS securities	34,515	24,978
Gross unrealized losses, 12 months or greater, short-term AFS securities	(289)	(666)
Fair value, short-term AFS securities	115,515	25,973
Gross unrealized losses, short-term AFS securities	(417)	(667)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	101,238	14,792
Gross unrealized losses, less than 12 months, long-term AFS securities	(417)	(36)
Fair value, 12 months or greater, long-term AFS securities	0	290
Gross unrealized losses, 12 months or greater, long-term AFS securities	0	(6)
Fair value, long-term AFS securities	101,238	15,082
Gross unrealized losses, long-term AFS securities	(417)	(42)
Corporate debt securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	24,046	5,819
Gross unrealized losses, less than 12 months, short-term AFS securities	(50)	(5)
Fair value, 12 months or greater, short-term AFS securities	29,065	99,504
Gross unrealized losses, 12 months or greater, short-term AFS securities	(256)	(1,823)
Fair value, short-term AFS securities	53,111	105,323
Gross unrealized losses, short-term AFS securities	(306)	(1,828)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	107,698	2,451
Gross unrealized losses, less than 12 months, long-term AFS securities	(384)	0
Fair value, 12 months or greater, long-term AFS securities	0	245
Gross unrealized losses, 12 months or greater, long-term AFS securities	0	(5)
Fair value, long-term AFS securities	107,698	2,696
Gross unrealized losses, long-term AFS securities	(384)	(5)
U.S. governmental agency securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	0	0
Gross unrealized losses, less than 12 months, short-term AFS securities	0	0
Fair value, 12 months or greater, short-term AFS securities	4,866	5,916
Gross unrealized losses, 12 months or greater, short-term AFS securities	(49)	(84)
Fair value, short-term AFS securities	4,866	5,916
Gross unrealized losses, short-term AFS securities	(49)	(84)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities		3,832
Gross unrealized losses, less than 12 months, long-term AFS securities		(25)
Fair value, 12 months or greater, long-term AFS securities		0
Gross unrealized losses, 12 months or greater, long-term AFS securities		0
Fair value, long-term AFS securities		3,832
Gross unrealized losses, long-term AFS securities		(25)
Total short-term AFS securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	105,046	6,814
Gross unrealized losses, less than 12 months, short-term AFS securities	(178)	(6)
Fair value, 12 months or greater, short-term AFS securities	68,446	130,398
Gross unrealized losses, 12 months or greater, short-term AFS securities	(594)	(2,573)
Fair value, short-term AFS securities	173,492	137,212
Gross unrealized losses, short-term AFS securities	(772)	(2,579)
Total long-term AFS securities
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	208,936	21,075
Gross unrealized losses, less than 12 months, long-term AFS securities	(801)	(61)
Fair value, 12 months or greater, long-term AFS securities	0	535
Gross unrealized losses, 12 months or greater, long-term AFS securities	0	(11)
Fair value, long-term AFS securities	208,936	21,610
Gross unrealized losses, long-term AFS securities	$ (801)	$ (72)