Quarterly report pursuant to Section 13 or 15(d)

Acquisition of American DG Energy, Inc. - Additional information (Details)

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Acquisition of American DG Energy, Inc. - Additional information (Details)
3 Months Ended 9 Months Ended
May 18, 2017
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]            
Revenue   $ 8,501,198 $ 6,616,455 $ 22,938,503 $ 17,379,278  
Energy production revenue   1,556,115 0   0  
Gross profit   3,258,031 $ 2,774,818 9,159,324 6,597,056  
Payment of stock issuance costs       (367,101) $ 0  
Shares issued in acquisition (shares) | shares 4,662,937          
Excess of cost over fair value of net assets acquired   12,602,409   12,602,409   $ 0
Discount rate used to calculate fair value of noncontrolling interest (percent) 5.61%          
General and Administrative Expense            
Business Acquisition [Line Items]            
Acquisition related costs   37,445   374,042    
American DG Energy, Inc.            
Business Acquisition [Line Items]            
Ownership interest (percent) 100.00%          
Energy production revenue       2,330,307    
Gross profit   $ 832,917   $ 1,276,566    
Excess of cost over fair value of net assets acquired $ 12,602,409          
Common Stock [Member]            
Business Acquisition [Line Items]            
Conversion ratio of American DG shares to Tecogen shares 0.092