Income taxes - Domestic and Foreign Components of Income (Loss) Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2017
Income Tax Disclosure [Abstract]
United States	$ (35,763)	$ (42,683)		$ (31,569)
Foreign	4,558	2,861		2,874
Loss before provision for income taxes	$ (31,205)	$ (39,822)	[1]	$ (28,695)	[1]

[1] See Note 1 for a summary of adjustments.