Quarterly report pursuant to Section 13 or 15(d)

Description of business and basis of presentation - Additional Information (Details)

v3.19.3
Description of business and basis of presentation - Additional Information (Details)
 9 Months Ended
May 18, 2017
Sep. 30, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]      
Ownerhsip interest in American DG New York, LLC (percent)   51.00%  
Number of business segments | segment   2  
Right of use assets   $ 2,294,951 $ 0
American DG Energy, Inc.      
Business Acquisition [Line Items]      
Ownership interest (percent) 100.00%    
Other Assets | Adjustments for New Accounting Pronouncement      
Business Acquisition [Line Items]      
Right of use assets   2,290,000  
Other Current Liabilities | Adjustments for New Accounting Pronouncement      
Business Acquisition [Line Items]      
Operating lease liabilities, current   530,000  
Other Noncurrent Liabilities | Adjustments for New Accounting Pronouncement      
Business Acquisition [Line Items]      
Operating lease liabilities, noncurrent   $ 1,760,000