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Subsequent Events (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended
May. 12, 2016
May. 04, 2016
Mar. 31, 2016
Mar. 31, 2015
Subsequent Event [Line Items]        
Amount of debt to be repaid with proceeds     $ 0 $ 1,000,000
EuroSite Power Inc.        
Subsequent Event [Line Items]        
Percentage of owned subsidiary     48.00%  
6% Convertible Debentures | Subsequent Event        
Subsequent Event [Line Items]        
Interest rate on convertible debt (percent)   6.00%    
Amount of debt converted to equity   $ 8,600,000    
6% Convertible Debentures | EuroSite Power Inc. | Subsequent Event        
Subsequent Event [Line Items]        
Shares issued in conversion of debt (shares)   14,720    
Ownership interest in subsidiary exchanged in conversion of debt (percent)   22.00%    
Private Placement | EuroSite Power Inc. | Subsequent Event        
Subsequent Event [Line Items]        
Maximum proceeds from private placement $ 7,250,000.00      
Share Price $ 0.575      
Board of Directors Chairman | Scenario, Forecast | Private Placement | EuroSite Power Inc.        
Subsequent Event [Line Items]        
Amount of debt to be repaid with proceeds $ 2,000,000