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Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Marketable Securities
Due within one year, amortized cost	$ 1,610
Due within one year, estimated fair value	1,622
Due after one year through five years, amortized cost	1,370
Due after one year through five years, estimated fair value	1,391
Due after five years, amortized cost
Due after five years, estimated fair value
Total available-for-sale securities, amortized cost	2,980
Total available-for-sale securities, estimated fair value	$ 3,013

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