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	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 173,916	$ 215,185
Unrealized Gains	17
Unrealized Losses		(31)
Estimated Fair Value	173,933	215,154
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	173,916	215,185
Unrealized Gains	17
Unrealized Losses		(31)
Estimated Fair Value	$ 173,933	$ 215,154

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).

+ References

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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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