Quarterly report pursuant to Section 13 or 15(d)

Property and equipment (Narrative) (Details)

v3.10.0.1
Property and equipment (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 644,000 $ 500 $ 5,642,000 $ 1,400
Impairment charge   26,858,023  
Impairment of property and equipment, cost portion of cryptocurrency miners written off     31,541,000  
Impairment of property and equipment, accumulated depreciation of cryptocurrency miners written off     $ 4,683,000