Income Taxes - Difference Between Expected Income Tax (Benefit) Expense and Actual Income Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income tax (benefit) expense at statutory rate	$ (6,284)	$ (7,379)	$ 2,191
State income taxes, net of federal benefit	(928)	(1,044)	435
Non-U.S. income tax rate differential	(121)	778	137
Research and development tax credits	(242)	(397)	(313)
Capital loss expiration	0	0	511
Permanent items	(9)	216	236
Changes in valuation allowance	7,489	6,789	(3,572)
Other, net	95	882	471
Income tax (benefit) expense	$ 0	$ (155)	$ 96