Summary of business and significant accounting policies - Property and Equipment (Details)	12 Months Ended
	Jun. 30, 2019
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment useful life	3 years
Computers and equipment
Property, Plant and Equipment [Line Items]
Property and equipment useful life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment useful life	5 years
Automobiles
Property, Plant and Equipment [Line Items]
Property and equipment useful life	5 years