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Investments and Fair Value Measurements - Available-For-Sale Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 643,216	$ 892,948
Gross Unrealized Gain	0	1
Gross Unrealized Loss	(12,102)	(2,243)
Fair Value	631,114	890,706
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	333,851	425,560
Gross Unrealized Gain	0	1
Gross Unrealized Loss	(5,983)	(1,086)
Fair Value	327,868	424,475
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	242,536	209,550
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(5,421)	(925)
Fair Value	237,115	208,625
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,498	124,098
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	(9)
Fair Value	6,498	124,089
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,938	98,857
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(397)	(140)
Fair Value	37,541	98,717
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,323	4,577
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(107)	(15)
Fair Value	2,216	4,562
Foreign government and supranational securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,070	30,306
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(194)	(68)
Fair Value	$ 19,876	$ 30,238

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- Definition

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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