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Description of Business and Basis of Presentation (Details)
shares in Thousands
3 Months Ended
May. 04, 2016
USD ($)
shares
Mar. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Accumulated deficit   $ (41,723,969) $ (40,622,774)
Number of operating segments | segment   1  
American DG New York, LLC      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Percentage of owned subsidiary   51.00%  
EuroSite Power Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Percentage of owned subsidiary   48.00%  
6% Convertible Debentures | Subsequent Event      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Interest rate on convertible debt (percent) 6.00%    
Amount of debt converted to equity $ 8,600,000    
6% Convertible Debentures | Subsequent Event | EuroSite Power Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Shares issued in conversion of debt (shares) | shares 14,720    
Ownership interest in subsidiary exchanged in conversion of debt (percent) 22.00%