Cash Equivalents and Marketable Securities - Schedule of Carrying Amounts and Fair Values of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,299,544	$ 195,221
Unrealized Gains	19	416
Unrealized Losses	(767)	(5)
Fair Value	1,298,796	195,632
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	726,769
Unrealized Gains	0
Unrealized Losses	(1)
Fair Value	726,768
Cash equivalents \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	684,485	56,474
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	684,485	56,474
Cash equivalents \| U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	22,000
Unrealized Gains	0
Unrealized Losses	0
Fair Value	22,000
Cash equivalents \| U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,286
Unrealized Gains	0
Unrealized Losses	(1)
Fair Value	4,285
Cash equivalents \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,998
Unrealized Gains	0
Unrealized Losses	0
Fair Value	15,998
Debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	572,775	138,747
Unrealized Gains	19	416
Unrealized Losses	(766)	(5)
Fair Value	572,028	139,158
Debt securities \| U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	442,715	50,087
Unrealized Gains	2	136
Unrealized Losses	(432)	0
Fair Value	442,285	50,223
Debt securities \| U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	75,725
Unrealized Gains	0
Unrealized Losses	(159)
Fair Value	75,566
Debt securities \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	54,335	85,413
Unrealized Gains	17	265
Unrealized Losses	(175)	(5)
Fair Value	$ 54,177	85,673
Debt securities \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3,247
Unrealized Gains		15
Unrealized Losses		0
Fair Value		$ 3,262

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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