Summary of business and significant accounting policies - Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 96,970	$ 90,640
Other comprehensive income (loss) before reclassifications, net of tax	233
Amount reclassified from accumulated other comprehensive loss, net of tax	(188)
Other comprehensive income (loss), net of tax	45	(252)
Ending balance	102,489	96,142
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(477)	(1,477)
Ending balance	(432)	$ (1,729)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,834)
Other comprehensive income (loss) before reclassifications, net of tax	360
Amount reclassified from accumulated other comprehensive loss, net of tax	0
Other comprehensive income (loss), net of tax	360
Ending balance	(1,474)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	1,357
Other comprehensive income (loss) before reclassifications, net of tax	(127)
Amount reclassified from accumulated other comprehensive loss, net of tax	(188)
Other comprehensive income (loss), net of tax	(315)
Ending balance	$ 1,042