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Summary of Significant Accounting Policies - (Available-For-Sale Marketable Securities) (Detail) - Bond Mutual Fund [Member] - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Amortized cost $ 2,154 $ 2,099
Unrealized gains 243 130
Fair value $ 2,397 $ 2,229