Marketable Securities - Tabular Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Marketable securities, available-for-sale:
Amortized cost	$ 915,070	$ 827,383
Unrealized gain		21
Unrealized losses	(13,860)	(2,709)
Fair value	901,210	824,695
U.S. government agency securities
Marketable securities, available-for-sale:
Amortized cost	429,423	498,582
Unrealized gain		21
Unrealized losses	(7,007)	(1,460)
Fair value	422,416	497,143
U.S. Treasury obligations
Marketable securities, available-for-sale:
Amortized cost	485,647	328,801
Unrealized losses	(6,853)	(1,249)
Fair value	$ 478,794	$ 327,552

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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