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Property and Equipment, Net - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Property Plant And Equipment Useful Life And Values [Abstract]        
Depreciation $ 97 $ 167 $ 91 $ 152