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Summary of Business and Significant Accounting Policies - Costs (Detail) - USD ($)
6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Summary of Business and Significant Accounting Policies      
Deferred financing costs $ 981,000   $ 981,000
Accumulated amortization of deferred financing costs 898,000   $ 740,000
Amortization of deferred financing costs $ 158,000 $ 108,000