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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Payables and Accruals [Abstract]      
Personnel costs $ 1,998 $ 1,763 $ 1,632
Clinical trial costs 798 742 1,984
Professional fees 571 926 590
Interest 343 254 0
Other 79 38 18
Accrued expenses $ 3,789 $ 3,723 $ 4,224