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Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Marketable Securities
Due within one year, amortized cost	$ 960
Due within one year, estimated fair value	967
Due after one year through five years, amortized cost	1,791
Due after one year through five years, estimated fair value	1,807
Due after five years, amortized cost
Due after five years, estimated fair value
Total available-for-sale securities, amortized cost	2,751
Total available-for-sale securities, estimated fair value	$ 2,774

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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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