Marketable Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Amortized Cost	$ 382,098	$ 427,863
Unrealized Gains	16
Unrealized Losses	(36)	(134)
Fair Value	382,078	427,729
U.S. Treasury Securities
Marketable Securities [Line Items]
Amortized Cost	288,541	324,917
Unrealized Gains	16
Unrealized Losses		(53)
Fair Value	288,557	324,864
Corporate Securities
Marketable Securities [Line Items]
Amortized Cost	93,557	102,946
Unrealized Losses	(36)	(81)
Fair Value	$ 93,521	$ 102,865

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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