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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	Dec. 31, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income tax benefit at statutory rate	$ (9,391)	$ (11,927)	$ (14,622)	$ (6,284)
State income taxes, net of federal benefit	(1,657)	(3,685)	(1,552)	(928)
Non-U.S. income tax rate differential	186	374	(66)	(121)
Change in fair value of derivative	3,900	0	7,227	0
Change in federal tax rate	0	0	14,673	0
Research and development tax credits	(231)	(150)	(284)	(242)
Permanent items	0	55	(15)	(9)
Changes in valuation allowance	7,166	15,608	(5,385)	7,489
Other, net	27	(275)	24	95
Income tax expense (benefit)	$ 0	$ 0	$ 0	$ 0

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