Marketable Securities and Equity Investments - Summary of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2022	Jun. 30, 2021	Dec. 31, 2021
Total marketable debt securities
Fair Value	$ 4,875,500		$ 3,977,100
Corporate equity securities
Amortized Cost	69,400		69,400
Gross Unrealized Gains	92,200	$ 167,100
Gross Unrealized Losses	(6,300)	$ (5,600)
Fair Value	155,300		230,900
Amortized Cost	554,900		568,900
Gross Unrealized Gains	92,200		167,100
Gross Unrealized Losses	(9,100)		(6,100)
Fair Value	638,000		729,900
Cash equivalents:
Total marketable debt securities
Amortized Cost	4,392,800		3,478,100
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Value	4,392,800		3,478,100
Cash equivalents: \| Money market funds
Total marketable debt securities
Amortized Cost	4,378,600		3,478,100
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Value	4,378,600		3,478,100
Cash equivalents: \| Commercial paper
Total marketable debt securities
Amortized Cost	14,200		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Value	14,200		0
Marketable securities
Total marketable debt securities
Amortized Cost	485,500		499,500
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(2,800)		(500)
Fair Value	482,700		499,000
Marketable securities \| U.S. Treasury securities
Total marketable debt securities
Amortized Cost	155,700		86,600
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,400)		(200)
Fair Value	154,300		86,400
Marketable securities \| Government-sponsored enterprise securities
Total marketable debt securities
Amortized Cost	7,100		69,000
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(100)		0
Fair Value	7,000		69,000
Marketable securities \| Corporate debt securities
Total marketable debt securities
Amortized Cost	77,400		91,100
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(600)		(200)
Fair Value	76,800		90,900
Marketable securities \| Commercial paper
Total marketable debt securities
Amortized Cost	245,300		252,800
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(700)		(100)
Fair Value	$ 244,600		$ 252,700

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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