Summary of business and significant accounting policies - Research and Software Development Costs (Details) (USD $)	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Capitalized software development costs during period	$ 0	$ 948,000	$ 2,400,000
Write-off of capitalized software development costs due to impairment	0	112,000	0
Deferred software development costs during period	943,000	1,300,000	2,400,000
Deferred capitalized software development costs	500,000	480,000
Other assets
Finite-Lived Intangible Assets [Line Items]
Unamortized capitalized software development costs	97,000	1,100,000
Cost of revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expense related to capitalized software costs	1,000,000	2,100,000	1,800,000
Development costs expensed	$ 922,000	$ 4,900,000	$ 354,000
Computer software | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful lives/amortization period	18 months
Computer software | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful lives/amortization period	24 months