Marketable Securities - Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Short-term AFS securities
Amortized cost, short-term AFS securities	$ 166,527	$ 129,120
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(3,790)	(3,148)
Fair value, short-term AFS securities	162,737	125,972
Long-term AFS securities
Amortized cost, long-term AFS securities	191,109	147,196
Gross unrealized gains, long-term AFS securities	12	0
Gross unrealized losses, long-term AFS securities	(1,667)	(8,279)
Fair value, long-term AFS securities	189,454	138,917
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	119,854	52,315
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(3,089)	(1,286)
Fair value, short-term AFS securities	116,765	51,029
Long-term AFS securities
Amortized cost, long-term AFS securities	59,542	115,207
Gross unrealized gains, long-term AFS securities	7	0
Gross unrealized losses, long-term AFS securities	(525)	(6,377)
Fair value, long-term AFS securities	59,024	108,830
U.S. Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	35,673	45,096
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(562)	(963)
Fair value, short-term AFS securities	35,111	44,133
Long-term AFS securities
Amortized cost, long-term AFS securities	126,739	25,990
Gross unrealized gains, long-term AFS securities	5	0
Gross unrealized losses, long-term AFS securities	(1,026)	(1,576)
Fair value, long-term AFS securities	125,718	24,414
U.S. governmental agency securities
Short-term AFS securities
Amortized cost, short-term AFS securities	11,000	22,806
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(139)	(722)
Fair value, short-term AFS securities	10,861	22,084
Long-term AFS securities
Amortized cost, long-term AFS securities	4,828	5,999
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(116)	(326)
Fair value, long-term AFS securities	$ 4,712	5,673
Municipal securities
Short-term AFS securities
Amortized cost, short-term AFS securities		8,903
Gross unrealized gains, short-term AFS securities		0
Gross unrealized losses, short-term AFS securities		(177)
Fair value, short-term AFS securities		$ 8,726