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Marketable Securities - Stated Maturities of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Due within one year	$ 56,756	$ 149,791
Due after one year through two years	352,458	0
Amortized Cost	409,214	149,791
Estimated Fair Value
Due within one year	56,756	149,903
Due after one year through two years	352,198	0
Total	$ 408,954	$ 149,903

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- Definition

Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Two

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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).

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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), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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