Annual report pursuant to Section 13 and 15(d)

Acquisition of American DG Energy Inc. - Assets Acquired and Liabilities Assumed in Acquisition (Details)

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Acquisition of American DG Energy Inc. - Assets Acquired and Liabilities Assumed in Acquisition (Details) - USD ($)
 12 Months Ended
May 18, 2017
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Tecogen common stock - 4,662,937 shares   $ 18,482,656 $ 0
Assumed fully vested equity awards   114,896 0
Financial liabilities   (7,729,667) 0
Noncontrolling interest in American DG New York, LLC   455,611 0
Goodwill   $ 13,365,655 $ 40,870
American DG Energy      
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    
Financial assets 1,542,137    
Inventory 75,374    
Prepaid and other current assets 358,628    
Property, plant and equipment 12,186,664    
Investment securities 519,568    
Favorable contract asset 1,561,739    
Financial liabilities (1,912,859)    
Unfavorable contract liability (8,341,922)    
Other liabilities (939)    
Total identifiable net assets 5,988,390    
Noncontrolling interest in American DG New York, LLC (453,272)    
Goodwill 13,324,785    
Consideration transferred $ 18,859,903