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Income Taxes - Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]        
U.S. operations $ (44,804) $ (53,000) $ (17,566) $ (19,780)
Non-U.S. operations 84 (171) (919) (1,922)
Loss before income taxes $ (44,720) $ (53,171) $ (18,485) $ (21,702)