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At September 30, 2021 and December 31, 2020, property and equipment consisted of: (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 33,663,000 $ 5,466,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (4,113,000) (3,343,000)
Property, Plant and Equipment, Net 29,550,000 2,123,000
Cryptocurrency Machines And Related Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 20,362,000 567,000
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 4,364,000 3,057,000
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 702,000 490,000
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,567,000 0
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,439,000 0
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 4,229,000 $ 1,352,000