Quarterly report pursuant to Section 13 or 15(d)

Acquisition of American DG Energy, Inc. - Consideration, and Assets and Liabilities Assumed (Details)

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Acquisition of American DG Energy, Inc. - Consideration, and Assets and Liabilities Assumed (Details) - USD ($)
 9 Months Ended
May 18, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]        
Tecogen common stock - 4,662,937 shares   $ 18,745,007 $ 0  
Assumed fully vested equity awards   114,896 $ 0  
Recognized amounts of identifiable assets acquired and liabilities assumed        
Financial liabilities   (10,358,283)   $ 0
Noncontrolling interest   483,243   0
Excess of cost over fair value of net assets acquired   $ 12,602,409   $ 0
American DG Energy, Inc.        
Business Acquisition [Line Items]        
Tecogen common stock - 4,662,937 shares $ 18,745,007      
Assumed fully vested equity awards 114,896      
Equity consideration 18,859,903      
Recognized amounts of identifiable assets acquired and liabilities assumed        
Financial assets 1,551,590      
Inventory 108,333      
Prepaid and other current assets 358,628      
Property, plant and equipment 15,430,250      
Investment securities 519,568      
Identifiable intangibles assets 1,456,166      
Financial liabilities (1,857,859)      
Unfavorable contract liability (10,838,571)      
Other liabilities (939)      
Total identifiable net assets 6,727,166      
Noncontrolling interest (469,672)      
Excess of cost over fair value of net assets acquired 12,602,409      
Consideration transferred $ 18,859,903