Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Description of business and basis of presentation - Additional Information (Details) - segment
9 Months Ended
May 18, 2017
Sep. 30, 2020
Business Acquisition [Line Items]    
Ownerhsip interest in American DG New York, LLC (percent)   51.00%
Number of business segments   2
American DG Energy, Inc.    
Business Acquisition [Line Items]    
Ownership interest (percent) 100.00%