Marketable Securities - Available-for-sale Securities - Continuous Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Total short-term AFS securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	$ 18,649	$ 3,799
Gross unrealized losses, less than 12 months, short-term AFS securities	(43)	(11)
Fair value, 12 months or greater, short-term AFS securities	149,855	122,173
Gross unrealized losses, 12 months or greater, short-term AFS securities	(4,183)	(3,137)
Fair value, short-term AFS securities	168,504	125,972
Gross unrealized losses, short-term AFS securities	(4,226)	(3,148)
Municipal securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities		0
Gross unrealized losses, less than 12 months, short-term AFS securities		0
Fair value, 12 months or greater, short-term AFS securities		8,726
Gross unrealized losses, 12 months or greater, short-term AFS securities		(177)
Fair value, short-term AFS securities		8,726
Gross unrealized losses, short-term AFS securities		(177)
Total long-term AFS securities
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	155,027	2,286
Gross unrealized losses, less than 12 months, long-term AFS securities	(778)	(66)
Fair value, 12 months or greater, long-term AFS securities	9,029	136,631
Gross unrealized losses, 12 months or greater, long-term AFS securities	(453)	(8,213)
Fair value, long-term AFS securities	164,056	138,917
Gross unrealized losses, long-term AFS securities	(1,231)	(8,279)
U.S. governmental agency securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	7,361	0
Gross unrealized losses, less than 12 months, short-term AFS securities	(6)	0
Fair value, 12 months or greater, short-term AFS securities	33,518	44,133
Gross unrealized losses, 12 months or greater, short-term AFS securities	(992)	(963)
Fair value, short-term AFS securities	40,879	44,133
Gross unrealized losses, short-term AFS securities	(998)	(963)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	103,039	282
Gross unrealized losses, less than 12 months, long-term AFS securities	(488)	(9)
Fair value, 12 months or greater, long-term AFS securities	2,188	24,132
Gross unrealized losses, 12 months or greater, long-term AFS securities	(103)	(1,567)
Fair value, long-term AFS securities	105,227	24,414
Gross unrealized losses, long-term AFS securities	(591)	(1,576)
Corporate debt securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	11,288	3,799
Gross unrealized losses, less than 12 months, short-term AFS securities	(37)	(11)
Fair value, 12 months or greater, short-term AFS securities	105,476	47,230
Gross unrealized losses, 12 months or greater, short-term AFS securities	(3,052)	(1,275)
Fair value, short-term AFS securities	116,764	51,029
Gross unrealized losses, short-term AFS securities	(3,089)	(1,286)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	48,226	2,004
Gross unrealized losses, less than 12 months, long-term AFS securities	(224)	(57)
Fair value, 12 months or greater, long-term AFS securities	5,891	106,826
Gross unrealized losses, 12 months or greater, long-term AFS securities	(301)	(6,320)
Fair value, long-term AFS securities	54,117	108,830
Gross unrealized losses, long-term AFS securities	(525)	(6,377)
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	10,861	22,084
Gross unrealized losses, 12 months or greater, short-term AFS securities	(139)	(722)
Fair value, short-term AFS securities	10,861	22,084
Gross unrealized losses, short-term AFS securities	(139)	(722)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	3,762	0
Gross unrealized losses, less than 12 months, long-term AFS securities	(66)	0
Fair value, 12 months or greater, long-term AFS securities	950	5,673
Gross unrealized losses, 12 months or greater, long-term AFS securities	(49)	(326)
Fair value, long-term AFS securities	4,712	5,673
Gross unrealized losses, long-term AFS securities	$ (115)	$ (326)