Marketable Securities - Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Short-term AFS securities
Amortized cost, short-term AFS securities	$ 142,903	$ 129,120
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(3,549)	(3,148)
Fair value, short-term AFS securities	139,354	125,972
Long-term AFS securities
Amortized cost, long-term AFS securities	104,978	147,196
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(5,275)	(8,279)
Fair value, long-term AFS securities	99,703	138,917
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	75,861	52,315
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(2,178)	(1,286)
Fair value, short-term AFS securities	73,683	51,029
Long-term AFS securities
Amortized cost, long-term AFS securities	79,998	115,207
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(4,010)	(6,377)
Fair value, long-term AFS securities	75,988	108,830
U.S. Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	32,844	45,096
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(615)	(963)
Fair value, short-term AFS securities	32,229	44,133
Long-term AFS securities
Amortized cost, long-term AFS securities	23,981	25,990
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(1,211)	(1,576)
Fair value, long-term AFS securities	22,770	24,414
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	(679)	(722)
Fair value, short-term AFS securities	27,126	22,084
Long-term AFS securities
Amortized cost, long-term AFS securities	999	5,999
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(54)	(326)
Fair value, long-term AFS securities	945	5,673
Municipal securities
Short-term AFS securities
Amortized cost, short-term AFS securities	6,393	8,903
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(77)	(177)
Fair value, short-term AFS securities	$ 6,316	$ 8,726