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 ($)
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment $ 24,391,467 $ 4,762,245
Less accumulated depreciation (1,899,041) (468,079)
Property and equipment, net 22,492,426 4,294,166
Cryptocurrency machine [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment 23,468,237 4,700,575
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment 852,512
Office and computer equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment $ 70,718 $ 61,670