Marketable Securities - Available-for-sale Securities - Continuous Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
U.S. Treasury securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	$ 4,926	$ 995
Gross unrealized losses, less than 12 months, short-term AFS securities	0	(1)
Fair value, 12 months or greater, short-term AFS securities	6,286	24,978
Gross unrealized losses, 12 months or greater, short-term AFS securities	(8)	(666)
Fair value, short-term AFS securities	11,212	25,973
Gross unrealized losses, short-term AFS securities	(8)	(667)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	13,950	14,792
Gross unrealized losses, less than 12 months, long-term AFS securities	(15)	(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	13,950	15,082
Gross unrealized losses, long-term AFS securities	(15)	(42)
Corporate debt securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	10,543	5,819
Gross unrealized losses, less than 12 months, short-term AFS securities	(3)	(5)
Fair value, 12 months or greater, short-term AFS securities	6,143	99,504
Gross unrealized losses, 12 months or greater, short-term AFS securities	(7)	(1,823)
Fair value, short-term AFS securities	16,686	105,323
Gross unrealized losses, short-term AFS securities	(10)	(1,828)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	13,277	2,451
Gross unrealized losses, less than 12 months, long-term AFS securities	(13)	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	13,277	2,696
Gross unrealized losses, long-term AFS securities	(13)	(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	4,933	5,916
Gross unrealized losses, 12 months or greater, short-term AFS securities	(12)	(84)
Fair value, short-term AFS securities	4,933	5,916
Gross unrealized losses, short-term AFS securities	(12)	(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	15,469	6,814
Gross unrealized losses, less than 12 months, short-term AFS securities	(3)	(6)
Fair value, 12 months or greater, short-term AFS securities	17,362	130,398
Gross unrealized losses, 12 months or greater, short-term AFS securities	(27)	(2,573)
Fair value, short-term AFS securities	32,831	137,212
Gross unrealized losses, short-term AFS securities	(30)	(2,579)
Total long-term AFS securities
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	27,227	21,075
Gross unrealized losses, less than 12 months, long-term AFS securities	(28)	(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	27,227	21,610
Gross unrealized losses, long-term AFS securities	$ (28)	$ (72)