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Marketable Securities and Long-Term Investments - Summary of Marketable Securities and Long-Term Investments Held (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Marketable securities held, Amortized Cost	$ 403,233	$ 137,509
Marketable securities held, Gross Unrealized Gains	41	13
Marketable securities held, Gross Unrealized Losses	(10)	(22)
Marketable securities held, Fair Value	403,264	137,500
Commercial Paper
Debt Securities, Available-for-sale [Line Items]
Marketable securities held, Amortized Cost	375,665	113,628
Marketable securities held, Gross Unrealized Gains	41	11
Marketable securities held, Gross Unrealized Losses	(7)	(17)
Marketable securities held, Fair Value	375,699	113,622
Corporate Notes
Debt Securities, Available-for-sale [Line Items]
Marketable securities held, Amortized Cost	27,568	7,839
Marketable securities held, Gross Unrealized Gains	0	2
Marketable securities held, Gross Unrealized Losses	(3)	(5)
Marketable securities held, Fair Value	$ 27,565	7,836
Government Securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities held, Amortized Cost		5,033
Marketable securities held, Gross Unrealized Gains		0
Marketable securities held, Gross Unrealized Losses		0
Marketable securities held, Fair Value		5,033
U.S. Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities held, Amortized Cost		11,009
Marketable securities held, Gross Unrealized Gains		0
Marketable securities held, Gross Unrealized Losses		0
Marketable securities held, Fair Value		$ 11,009

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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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