Annual report pursuant to Section 13 and 15(d)

Property and equipment (Schedule of Impairment Charges) (Details)

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Property and equipment (Schedule of Impairment Charges) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Impairment charge $ 29,237,719 $ 5,218,004
Prive Miners [Member]    
Property, Plant and Equipment [Line Items]    
Impairment charge 17,690,541
BMSS Miners [Member]    
Property, Plant and Equipment [Line Items]    
Impairment charge 6,701,971
Kairos Miners [Member]    
Property, Plant and Equipment [Line Items]    
Impairment charge 3,025,761 5,218,004
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Impairment charge $ 1,819,446