Marketable Securities - Available-for-sale Securities - Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
U.S. Treasury securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	$ 29,247	$ 995
Gross unrealized losses, less than 12 months, short-term AFS securities	(73)	(1)
Fair value, 12 months or greater, short-term AFS securities	23,487	24,978
Gross unrealized losses, 12 months or greater, short-term AFS securities	(439)	(666)
Fair value, short-term AFS securities	52,734	25,973
Gross unrealized losses, short-term AFS securities	(512)	(667)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	73,282	14,792
Gross unrealized losses, less than 12 months, long-term AFS securities	(328)	(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	73,282	15,082
Gross unrealized losses, long-term AFS securities	(328)	(42)
Corporate debt securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	9,628	5,819
Gross unrealized losses, less than 12 months, short-term AFS securities	(16)	(5)
Fair value, 12 months or greater, short-term AFS securities	66,987	99,504
Gross unrealized losses, 12 months or greater, short-term AFS securities	(832)	(1,823)
Fair value, short-term AFS securities	76,615	105,323
Gross unrealized losses, short-term AFS securities	(848)	(1,828)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	68,341	2,451
Gross unrealized losses, less than 12 months, long-term AFS securities	(190)	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	68,341	2,696
Gross unrealized losses, long-term AFS securities	(190)	(5)
U.S. governmental agency securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	1,938	0
Gross unrealized losses, less than 12 months, short-term AFS securities	(17)	0
Fair value, 12 months or greater, short-term AFS securities	973	5,916
Gross unrealized losses, 12 months or greater, short-term AFS securities	(27)	(84)
Fair value, short-term AFS securities	2,911	5,916
Gross unrealized losses, short-term AFS securities	(44)	(84)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	1,909	3,832
Gross unrealized losses, less than 12 months, long-term AFS securities	(22)	(25)
Fair value, 12 months or greater, long-term AFS securities	0	0
Gross unrealized losses, 12 months or greater, long-term AFS securities	0	0
Fair value, long-term AFS securities	1,909	3,832
Gross unrealized losses, long-term AFS securities	(22)	(25)
Total short-term AFS securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	40,813	6,814
Gross unrealized losses, less than 12 months, short-term AFS securities	(106)	(6)
Fair value, 12 months or greater, short-term AFS securities	91,447	130,398
Gross unrealized losses, 12 months or greater, short-term AFS securities	(1,298)	(2,573)
Fair value, short-term AFS securities	132,260	137,212
Gross unrealized losses, short-term AFS securities	(1,404)	(2,579)
Total long-term AFS securities
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	143,532	21,075
Gross unrealized losses, less than 12 months, long-term AFS securities	(540)	(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	143,532	21,610
Gross unrealized losses, long-term AFS securities	$ (540)	$ (72)