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Investments, Available-for-Sale - Schedule of Cost, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses and Fair Value of Available for Sale Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Short-term Investments
Schedule Of Available For Sale Securities [Line Items]
Investments, available-for-sale, Amortized Cost	$ 48,392	$ 215,185
Investments, available-for-sale, Unrealized Gains	1
Investments, available-for-sale, Unrealized Losses		(31)
Investments, available-for-sale, Estimated Fair Value	48,393	215,154
Long Term Investments
Schedule Of Available For Sale Securities [Line Items]
Investments, available-for-sale, Amortized Cost	6,959
Investments, available-for-sale, Unrealized Losses	(3)
Investments, available-for-sale, Estimated Fair Value	6,956
U.S. Treasury Securities | Short-term Investments
Schedule Of Available For Sale Securities [Line Items]
Investments, available-for-sale, Amortized Cost	47,656	215,185
Investments, available-for-sale, Unrealized Gains	1
Investments, available-for-sale, Unrealized Losses		(31)
Investments, available-for-sale, Estimated Fair Value	47,657	$ 215,154
U.S. Treasury Securities | Long Term Investments
Schedule Of Available For Sale Securities [Line Items]
Investments, available-for-sale, Amortized Cost	6,006
Investments, available-for-sale, Unrealized Losses	(3)
Investments, available-for-sale, Estimated Fair Value	6,003
Certificates of deposit | Short-term Investments
Schedule Of Available For Sale Securities [Line Items]
Investments, available-for-sale, Amortized Cost	736
Investments, available-for-sale, Estimated Fair Value	736
Certificates of deposit | Long Term Investments
Schedule Of Available For Sale Securities [Line Items]
Investments, available-for-sale, Amortized Cost	953
Investments, available-for-sale, Estimated Fair Value	$ 953

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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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