Available-for-sale Securities - Summary of Estimated Value of Available-for-sale Securities and Cash Equivalents and Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 649,103	$ 441,963
Gross Unrealized Gain	41	131
Gross Unrealized Loss	(32)	(15)
Estimated Fair Value	649,112	442,079
Marketable Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	450,713	336,352
Gross Unrealized Gain	41	131
Gross Unrealized Loss	(32)	(10)
Estimated Fair Value	450,722	336,473
Marketable Securities \| Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	231,886	69,871
Gross Unrealized Gain	16
Gross Unrealized Loss	(17)	(5)
Estimated Fair Value	231,885	69,866
Marketable Securities \| U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	114,373	266,481
Gross Unrealized Gain	22	131
Gross Unrealized Loss		(5)
Estimated Fair Value	114,395	266,607
Marketable Securities \| Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	104,454
Gross Unrealized Gain	3
Gross Unrealized Loss	(15)
Estimated Fair Value	104,442
Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	198,390	105,611
Gross Unrealized Loss		(5)
Estimated Fair Value	198,390	105,606
Cash Equivalents \| Money Market Funds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	192,391	16,696
Estimated Fair Value	192,391	16,696
Cash Equivalents \| Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,999	81,800
Gross Unrealized Loss		(3)
Estimated Fair Value	$ 5,999	81,797
Cash Equivalents \| U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		3,913
Estimated Fair Value		3,913
Cash Equivalents \| Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		3,202
Gross Unrealized Loss		(2)
Estimated Fair Value		$ 3,200

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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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Amount of 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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