Marketable Securities - Available-for-sale Securities - Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Total short-term AFS securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	$ 4,034	$ 3,799
Gross unrealized losses, less than 12 months, short-term AFS securities	(11)	(11)
Fair value, 12 months or greater, short-term AFS securities	135,320	122,173
Gross unrealized losses, 12 months or greater, short-term AFS securities	(3,538)	(3,137)
Fair value, short-term AFS securities	139,354	125,972
Gross unrealized losses, short-term AFS securities	(3,549)	(3,148)
Municipal 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	6,316	8,726
Gross unrealized losses, 12 months or greater, short-term AFS securities	(77)	(177)
Fair value, short-term AFS securities	6,316	8,726
Gross unrealized losses, short-term AFS securities	(77)	(177)
Total long-term AFS securities
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	841	2,286
Gross unrealized losses, less than 12 months, long-term AFS securities	(21)	(66)
Fair value, 12 months or greater, long-term AFS securities	98,862	136,631
Gross unrealized losses, 12 months or greater, long-term AFS securities	(5,254)	(8,213)
Fair value, long-term AFS securities	99,703	138,917
Gross unrealized losses, long-term AFS securities	(5,275)	(8,279)
Corporate debt securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	4,034	3,799
Gross unrealized losses, less than 12 months, short-term AFS securities	(11)	(11)
Fair value, 12 months or greater, short-term AFS securities	69,649	47,230
Gross unrealized losses, 12 months or greater, short-term AFS securities	(2,167)	(1,275)
Fair value, short-term AFS securities	73,683	51,029
Gross unrealized losses, short-term AFS securities	(2,178)	(1,286)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	555	2,004
Gross unrealized losses, less than 12 months, long-term AFS securities	(14)	(57)
Fair value, 12 months or greater, long-term AFS securities	75,433	106,826
Gross unrealized losses, 12 months or greater, long-term AFS securities	(3,996)	(6,320)
Fair value, long-term AFS securities	75,988	108,830
Gross unrealized losses, long-term AFS securities	(4,010)	(6,377)
U.S. Treasury 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	32,229	44,133
Gross unrealized losses, 12 months or greater, short-term AFS securities	(615)	(963)
Fair value, short-term AFS securities	32,229	44,133
Gross unrealized losses, short-term AFS securities	(615)	(963)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	286	282
Gross unrealized losses, less than 12 months, long-term AFS securities	(7)	(9)
Fair value, 12 months or greater, long-term AFS securities	22,484	24,132
Gross unrealized losses, 12 months or greater, long-term AFS securities	(1,204)	(1,567)
Fair value, long-term AFS securities	22,770	24,414
Gross unrealized losses, long-term AFS securities	(1,211)	(1,576)
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	27,126	22,084
Gross unrealized losses, 12 months or greater, short-term AFS securities	(679)	(722)
Fair value, short-term AFS securities	27,126	22,084
Gross unrealized losses, short-term AFS securities	(679)	(722)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	0	0
Gross unrealized losses, less than 12 months, long-term AFS securities	0	0
Fair value, 12 months or greater, long-term AFS securities	945	5,673
Gross unrealized losses, 12 months or greater, long-term AFS securities	(54)	(326)
Fair value, long-term AFS securities	945	5,673
Gross unrealized losses, long-term AFS securities	$ (54)	$ (326)