Marketable Securities - Available-for-sale Securities - Continuous Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Total short-term AFS securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	$ 5,621	$ 3,799
Gross unrealized losses, less than 12 months, short-term AFS securities	(4)	(11)
Fair value, 12 months or greater, short-term AFS securities	165,602	122,173
Gross unrealized losses, 12 months or greater, short-term AFS securities	(4,065)	(3,137)
Fair value, short-term AFS securities	171,223	125,972
Gross unrealized losses, short-term AFS securities	(4,069)	(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	3,863	8,726
Gross unrealized losses, 12 months or greater, short-term AFS securities	(27)	(177)
Fair value, short-term AFS securities	3,863	8,726
Gross unrealized losses, short-term AFS securities	(27)	(177)
Total long-term AFS securities
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	43,341	2,286
Gross unrealized losses, less than 12 months, long-term AFS securities	(332)	(66)
Fair value, 12 months or greater, long-term AFS securities	50,179	136,631
Gross unrealized losses, 12 months or greater, long-term AFS securities	(2,935)	(8,213)
Fair value, long-term AFS securities	93,520	138,917
Gross unrealized losses, long-term AFS securities	(3,267)	(8,279)
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	27,346	44,133
Gross unrealized losses, 12 months or greater, short-term AFS securities	(498)	(963)
Fair value, short-term AFS securities	27,346	44,133
Gross unrealized losses, short-term AFS securities	(498)	(963)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	32,487	282
Gross unrealized losses, less than 12 months, long-term AFS securities	(249)	(9)
Fair value, 12 months or greater, long-term AFS securities	18,605	24,132
Gross unrealized losses, 12 months or greater, long-term AFS securities	(1,072)	(1,567)
Fair value, long-term AFS securities	51,092	24,414
Gross unrealized losses, long-term AFS securities	(1,321)	(1,576)
Corporate debt securities
Short-term AFS securities
Fair value, less than 12 months, short-term AFS securities	5,621	3,799
Gross unrealized losses, less than 12 months, short-term AFS securities	(4)	(11)
Fair value, 12 months or greater, short-term AFS securities	107,002	47,230
Gross unrealized losses, 12 months or greater, short-term AFS securities	(3,126)	(1,275)
Fair value, short-term AFS securities	112,623	51,029
Gross unrealized losses, short-term AFS securities	(3,130)	(1,286)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	7,116	2,004
Gross unrealized losses, less than 12 months, long-term AFS securities	(22)	(57)
Fair value, 12 months or greater, long-term AFS securities	30,633	106,826
Gross unrealized losses, 12 months or greater, long-term AFS securities	(1,805)	(6,320)
Fair value, long-term AFS securities	37,749	108,830
Gross unrealized losses, long-term AFS securities	(1,827)	(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	27,391	22,084
Gross unrealized losses, 12 months or greater, short-term AFS securities	(414)	(722)
Fair value, short-term AFS securities	27,391	22,084
Gross unrealized losses, short-term AFS securities	(414)	(722)
Long-term AFS securities
Fair value, less than 12 months, long-term AFS securities	3,738	0
Gross unrealized losses, less than 12 months, long-term AFS securities	(61)	0
Fair value, 12 months or greater, long-term AFS securities	941	5,673
Gross unrealized losses, 12 months or greater, long-term AFS securities	(58)	(326)
Fair value, long-term AFS securities	4,679	5,673
Gross unrealized losses, long-term AFS securities	$ (119)	$ (326)