Quarterly report pursuant to Section 13 or 15(d)

Property and equipment (Schedule of Property and Equipment) (Details)

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Property and equipment (Schedule of Property and Equipment) (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment $ 6,280,774 $ 4,762,245
Less accumulated depreciation (1,427,030) (468,079)
Property and equipment, net 4,853,744 4,294,166
Cryptocurrency machine [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment 4,118,675 4,700,575
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment 2,069,259
Office and computer equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment $ 92,840 $ 61,670