Marketable Securities - Summary of Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 122,706	$ 205,382
Gross Unrealized Gains	24	21
Gross Unrealized Losses	(1)	(1)
Estimated Fair Market Value	122,729	205,402
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,501	8,547
Gross Unrealized Gains		4
Gross Unrealized Losses	(1)
Estimated Fair Market Value	5,500	8,551
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	16,988	26,469
Estimated Fair Market Value	16,988	26,469
U.S. Government Treasury Bills
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	100,217	170,366
Gross Unrealized Gains	24	17
Gross Unrealized Losses		(1)
Estimated Fair Market Value	$ 100,241	$ 170,382

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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