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Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Marketable Securities
Due within one year, amortized cost	$ 705
Due after one year through five years, amortized cost	703
Due after five years, amortized cost
Total available-for-sale securities, amortized cost	1,408
Due within one year, estimated fair value	713
Due after one year through five years, estimated fair value	707
Due after five years, estimated fair value
Total available-for-sale securities, estimated fair value	$ 1,420

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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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