Summary of significant accounting policies (Details)	12 Months Ended
	Nov. 30, 2017
Computer hardware and software [Member]
Property, Plant and Equipment, Useful Life	3 years
Machinery and equipment [Member]
Property, Plant and Equipment, Useful Life	3 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life	5 years
Vehicles [Member]
Property, Plant and Equipment, Useful Life	3 years
Leasehold improvements [Member]
Property, Plant and Equipment, Estimated Useful Lives	lease term