Quarterly report pursuant to Section 13 or 15(d)

Loans Payable (Promissory Notes) (Details)

v3.6.0.2
Loans Payable (Promissory Notes) (Details) - USD ($)
6 Months Ended
Oct. 10, 2016
Jun. 14, 2016
Apr. 13, 2016
Mar. 24, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 08, 2016
Dec. 03, 2015
Sep. 29, 2015
Sep. 08, 2015
Debt Instrument [Line Items]                      
Outstanding balances         $ 10,794,000   $ 28,712,000        
Number of shares issued (in shares)                 437,500    
Conversion of MGT Sports Convertible Securities                      
Debt Instrument [Line Items]                      
Payment of interest $ 16,000                    
Unsecured Debt | MGT Promissory Notes                      
Debt Instrument [Line Items]                      
Principal amount         2,109,000            
Outstanding balances         0   943,000        
Interest expense         12,000            
Unsecured Debt | MGT Promissory Notes Due September 29, 2015                      
Debt Instrument [Line Items]                      
Principal amount                   $ 234,000  
Unsecured Debt | MGT Promissory Notes Due March 8, 2016                      
Debt Instrument [Line Items]                      
Principal amount               $ 1,875,000      
Unsecured Debt | Kuusamo Promissory Notes                      
Debt Instrument [Line Items]                      
Principal amount         141,000            
Outstanding balances         0   $ 55,000        
Interest expense         $ 1,000,000            
Unsecured Debt | Kuusamo Promissory Notes Due September 29, 2015                      
Debt Instrument [Line Items]                      
Principal amount                     $ 16,000
Unsecured Debt | Kuusamo Promissory Notes Due March 8, 2016                      
Debt Instrument [Line Items]                      
Principal amount                     $ 125,000
Promissory Note                      
Debt Instrument [Line Items]                      
Stated interest rate (as a percent)                   5.00% 5.00%
Common Stock                      
Debt Instrument [Line Items]                      
Shares converted (in shares)     18,332                
Series D Preferred Stock                      
Debt Instrument [Line Items]                      
Preferred stock, shares outstanding (in shares)     0   0   0        
Series D Preferred Stock | Unsecured Debt | MGT Promissory Notes Due March 8, 2016                      
Debt Instrument [Line Items]                      
Debt converted value       $ 110,000              
Series D Preferred Stock | Preferred Stock                      
Debt Instrument [Line Items]                      
Shares converted (in shares)     110                
Common Stock                      
Debt Instrument [Line Items]                      
Number of shares issued (in shares) 136,304         1,013,068          
Common Stock | Unsecured Debt | MGT Promissory Notes Due March 8, 2016                      
Debt Instrument [Line Items]                      
Debt converted value       $ 824,000              
Outstanding balances         $ 0            
Common Stock | Unsecured Debt | Kuusamo Promissory Notes Due March 8, 2016                      
Debt Instrument [Line Items]                      
Issuance of conversion shares (in shares)         8,410            
Second MGT Exchange Agreement                      
Debt Instrument [Line Items]                      
Debt converted value   $ 11,000                  
Convertible debt   $ 940,000                  
Second MGT Exchange Agreement | Common Stock                      
Debt Instrument [Line Items]                      
Issuance of conversion shares (in shares)   132,092