Income taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Current income taxes
Federal	$ 0	$ (435)	$ 70
State	32	(1,075)	5
Foreign	1,048	2,131	261
Total current income taxes	1,080	621	336
Deferred income taxes
Federal	0	0	0
State	0	0	0
Foreign	(68)	220	175
Total deferred income taxes	(68)	220	175
Provision (benefit) for income taxes from continuing operations	$ 1,012	$ 841	$ 511