Income taxes - Domestic and Foreign Components of Income (Loss) Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
United States	$ (1,667)	$ (28,834)	$ (39,278)
Foreign	5,239	4,558	2,860
Income (loss) from continuing operations before provision for income taxes	3,572	(24,276)	(36,418)
Equity in net income of equity method investees	876	0	0
Loss on discontinued operations before provision for income taxes	(4,042)	(6,929)	(3,404)
Total income (loss) before provision for income taxes	$ 406	$ (31,205)	$ (39,822)