Summary of business and significant accounting policies - Accumulated Other Comprehensive Income, Net of Tax (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, net of tax as of June 30, 2013	$ 373
Other comprehensive income before reclassifications, net of tax	190
Amount reclassified from accumulated other comprehensive income, net of tax	(19)
Other comprehensive income, net of tax	171
Balance, net of tax as of September 30, 2013	544
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, net of tax as of June 30, 2013	270
Other comprehensive income before reclassifications, net of tax	51
Amount reclassified from accumulated other comprehensive income, net of tax	0
Other comprehensive income, net of tax	51
Balance, net of tax as of September 30, 2013	321
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, net of tax as of June 30, 2013	103
Other comprehensive income before reclassifications, net of tax	139
Amount reclassified from accumulated other comprehensive income, net of tax	(19)
Other comprehensive income, net of tax	120
Balance, net of tax as of September 30, 2013	$ 223