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Loans Payable (Promissory Notes) (Details) - USD ($)
12 Months Ended
Oct. 10, 2016
Jun. 14, 2016
Apr. 25, 2016
Apr. 13, 2016
Mar. 24, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2013
Sep. 30, 2016
Dec. 03, 2015
Sep. 08, 2015
Debt Instrument [Line Items]                      
Common stock issued to settle notes         $ 825,000 $ 868,000 $ 0        
Series D issuance           110,000 0        
Long-term debt           28,712,000 24,091,000        
Shares issued (shares)                   437,500.0  
MGT Promissory Notes Due March 8, 2016                      
Debt Instrument [Line Items]                      
Common stock issued to settle notes           824,000          
Unsecured Debt | MGT Promissory Notes Due September 29, 2015                      
Debt Instrument [Line Items]                      
Debt instrument, face amount           234,000          
Unsecured Debt | MGT Promissory Notes Due March 8, 2016                      
Debt Instrument [Line Items]                      
Debt instrument, face amount           1,875,000          
Unsecured Debt | Kuusamo Promissory Notes Due September 29, 2015                      
Debt Instrument [Line Items]                      
Debt instrument, face amount           16,000          
Unsecured Debt | Kuusamo Promissory Notes Due March 8, 2016                      
Debt Instrument [Line Items]                      
Debt instrument, face amount           125,000          
Long-term debt           54,000          
Promissory Note                      
Debt Instrument [Line Items]                      
Interest rate                     5.00%
Loans Payable | MGT Promissory Notes                      
Debt Instrument [Line Items]                      
Debt instrument, face amount           2,109,000          
Long-term debt           943,000 0        
Interest expense           65,000          
Loans Payable | Kuusamo Promissory Notes                      
Debt Instrument [Line Items]                      
Debt instrument, face amount           141,000          
Long-term debt           55,000 $ 0        
Interest expense           $ 5,000          
Series D Preferred Stock                      
Debt Instrument [Line Items]                      
Preferred stock, shares outstanding (in shares)       0   0 0        
Class D Preferred Stock                      
Debt Instrument [Line Items]                      
Series D issuance           $ 110,000          
Class D Preferred Stock | Series D Preferred Stock                      
Debt Instrument [Line Items]                      
Shares converted to common stock (shares)       110              
Common Stock                      
Debt Instrument [Line Items]                      
Shares converted to common stock (shares)       18,331.5              
Second MGT Exchange Agreement                      
Debt Instrument [Line Items]                      
Convertible debt   $ 940,000                  
Notes redeemed amount   $ 11,000                  
Second MGT Exchange Agreement | Common Stock                      
Debt Instrument [Line Items]                      
Common shares issued subject to certain adjustments (shares)   132,092                  
DDGG                      
Debt Instrument [Line Items]                      
Number of shares issued in acquisition (shares)     10,394.35                
Reduction of debt     $ 71,000                
Sillerman Investment Company, LLC | New $25,000 Line of Credit                      
Debt Instrument [Line Items]                      
Compensation expense               $ 110,000      
Subsequent Event | Conversion of MGT Sports Convertible Securities                      
Debt Instrument [Line Items]                      
Payment of interest $ 16,000                    
Subsequent Event | Common Stock                      
Debt Instrument [Line Items]                      
Shares issued (shares) 136,304               1,013,068    
Subsequent Event | Common Stock | Conversion of MGT Sports Convertible Securities                      
Debt Instrument [Line Items]                      
Common shares issued subject to certain adjustments (shares) 136,304