Income taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Current income taxes:
Federal	$ 0	$ 0	$ 0
State	40	14	32
Foreign	2,047	1,598	1,048
Total current income taxes	2,087	1,612	1,080
Deferred income taxes:
Federal	0	17	0
State	0	0	0
Foreign	(751)	(253)	(68)
Total deferred income taxes	(751)	(236)	(68)
Total provision for income taxes	$ 1,336	$ 1,376	$ 1,012