Marketable Securities - Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Short-term AFS securities
Amortized cost, short-term AFS securities	$ 287,214	$ 164,612
Gross unrealized gains, short-term AFS securities	1,141	61
Gross unrealized losses, short-term AFS securities	(30)	(2,579)
Fair value, short-term AFS securities	288,325	162,094
Long-term AFS securities
Amortized cost, long-term AFS securities	324,329	255,796
Gross unrealized gains, long-term AFS securities	3,134	1,909
Gross unrealized losses, long-term AFS securities	(28)	(72)
Fair value, long-term AFS securities	327,435	257,633
U.S. Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	167,580	48,721
Gross unrealized gains, short-term AFS securities	614	55
Gross unrealized losses, short-term AFS securities	(8)	(667)
Fair value, short-term AFS securities	168,186	48,109
Long-term AFS securities
Amortized cost, long-term AFS securities	137,605	148,878
Gross unrealized gains, long-term AFS securities	1,228	1,023
Gross unrealized losses, long-term AFS securities	(15)	(42)
Fair value, long-term AFS securities	138,818	149,859
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	114,689	109,891
Gross unrealized gains, short-term AFS securities	527	6
Gross unrealized losses, short-term AFS securities	(10)	(1,828)
Fair value, short-term AFS securities	115,206	108,069
Long-term AFS securities
Amortized cost, long-term AFS securities	186,724	103,061
Gross unrealized gains, long-term AFS securities	1,906	886
Gross unrealized losses, long-term AFS securities	(13)	(5)
Fair value, long-term AFS securities	188,617	103,942
U.S. governmental agency securities
Short-term AFS securities
Amortized cost, short-term AFS securities	4,945	6,000
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(12)	(84)
Fair value, short-term AFS securities	$ 4,933	5,916
Long-term AFS securities
Amortized cost, long-term AFS securities		3,857
Gross unrealized gains, long-term AFS securities		0
Gross unrealized losses, long-term AFS securities		(25)
Fair value, long-term AFS securities		$ 3,832

Debt Securities, Available-for-sale Securities, Current

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Topic 326
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