Marketable Securities - Available for Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Short-term AFS securities
Amortized cost, short-term AFS securities	$ 164,612	$ 129,120
Gross unrealized gains, short-term AFS securities	61	0
Gross unrealized losses, short-term AFS securities	(2,579)	(3,148)
Fair value, short-term AFS securities	162,094	125,972
Long-term AFS securities
Amortized cost, long-term AFS securities	255,796	147,196
Gross unrealized gains, long-term AFS securities	1,909	0
Gross unrealized losses, long-term AFS securities	(72)	(8,279)
Fair value, long-term AFS securities	257,633	138,917
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	109,891	52,315
Gross unrealized gains, short-term AFS securities	6	0
Gross unrealized losses, short-term AFS securities	(1,828)	(1,286)
Fair value, short-term AFS securities	108,069	51,029
Long-term AFS securities
Amortized cost, long-term AFS securities	103,061	115,207
Gross unrealized gains, long-term AFS securities	886	0
Gross unrealized losses, long-term AFS securities	(5)	(6,377)
Fair value, long-term AFS securities	103,942	108,830
U.S. Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	48,721	45,096
Gross unrealized gains, short-term AFS securities	55	0
Gross unrealized losses, short-term AFS securities	(667)	(963)
Fair value, short-term AFS securities	48,109	44,133
Long-term AFS securities
Amortized cost, long-term AFS securities	148,878	25,990
Gross unrealized gains, long-term AFS securities	1,023	0
Gross unrealized losses, long-term AFS securities	(42)	(1,576)
Fair value, long-term AFS securities	149,859	24,414
U.S. governmental agency securities
Short-term AFS securities
Amortized cost, short-term AFS securities	6,000	22,806
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(84)	(722)
Fair value, short-term AFS securities	5,916	22,084
Long-term AFS securities
Amortized cost, long-term AFS securities	3,857	5,999
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(25)	(326)
Fair value, long-term AFS securities	$ 3,832	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