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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation, amount recognized $ 1 $ 5
2011 Director Stock Option Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted 0 0