Marketable Securities - Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Short-term AFS securities
Amortized cost, short-term AFS securities	$ 175,292	$ 129,120
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(4,069)	(3,148)
Fair value, short-term AFS securities	171,223	125,972
Long-term AFS securities
Amortized cost, long-term AFS securities	96,787	147,196
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(3,267)	(8,279)
Fair value, long-term AFS securities	93,520	138,917
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	115,753	52,315
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(3,130)	(1,286)
Fair value, short-term AFS securities	112,623	51,029
Long-term AFS securities
Amortized cost, long-term AFS securities	39,576	115,207
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(1,827)	(6,377)
Fair value, long-term AFS securities	37,749	108,830
U.S. governmental agency securities
Short-term AFS securities
Amortized cost, short-term AFS securities	27,805	22,806
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(414)	(722)
Fair value, short-term AFS securities	27,391	22,084
Long-term AFS securities
Amortized cost, long-term AFS securities	4,798	5,999
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(119)	(326)
Fair value, long-term AFS securities	4,679	5,673
U.S. Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	27,844	45,096
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(498)	(963)
Fair value, short-term AFS securities	27,346	44,133
Long-term AFS securities
Amortized cost, long-term AFS securities	52,413	25,990
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(1,321)	(1,576)
Fair value, long-term AFS securities	51,092	24,414
Municipal securities
Short-term AFS securities
Amortized cost, short-term AFS securities	3,890	8,903
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(27)	(177)
Fair value, short-term AFS securities	$ 3,863	$ 8,726