Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 251,156	$ 189,949
Gross Unrealized Gains	9	13
Gross Unrealized Losses	(103)
Fair Value	251,062	189,962
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	161,109
Gross Unrealized Gains	1
Gross Unrealized Losses	(103)
Fair Value	161,007
US Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	84,988	189,949
Gross Unrealized Gains	8	13
Fair Value	84,996	$ 189,962
U.S. Government Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,059
Fair Value	$ 5,059

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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