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Short-Term Investments - Schedule of Cost, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses and Fair Value of Available for Sale Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 90,987	$ 215,185
Unrealized Gains	3
Unrealized Losses		(31)
Estimated Fair Value	90,990	215,154
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	90,987	215,185
Unrealized Gains	3
Unrealized Losses		(31)
Estimated Fair Value	$ 90,990	$ 215,154

X

- Definition

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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