Income Taxes - Valuation allowance for deferred tax assets (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Deferred Tax Assets Valuation Allowance [Roll Forward]
Balance at beginning of period	$ 438	$ 4,614	$ 26,622
Provision for income taxes	423	(4,111)	(19,709)
Net operating loss utilization	0	(65)	(2,299)
Balance at end of period	$ 861	$ 438	$ 4,614