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Marketable Securities - Maturities of Available-for-sale Securities (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Marketable Securities  
Due within one year, amortized cost $ 959
Due after one year through five years, amortized cost 1,017
Due after five years, amortized cost
Total available-for-sale securities, amortized cost 1,976
Due within one year, estimated fair value 969
Due after one year through five years, estimated fair value 1,028
Due after five years, estimated fair value
Total available-for-sale securities, estimated fair value $ 1,997