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Income Taxes - Difference Between Expected Income Tax Benefit and Actual Income Tax Benefit (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]
Income tax benefit at statutory rate	$ (9,391)	$ (14,622)	$ (6,284)	$ (7,379)
State income taxes, net of federal benefit	(1,657)	(1,552)	(928)	(1,044)
Non-U.S. income tax rate differential	186	(66)	(121)	778
Change in fair value of derivative	3,900	7,227	0	0
Change in federal tax rate	0	14,673	0	0
Research and development tax credits	(231)	(284)	(242)	(397)
Permanent items	0	(15)	(9)	216
Changes in valuation allowance	7,166	(5,385)	7,489	6,789
Other, net	27	24	95	882
Income tax expense (benefit)	$ 0	$ 0	$ 0	$ (155)

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