Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Description of business and basis of presentation - Additional Information (Details)
3 Months Ended 6 Months Ended
May 18, 2017
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
Jun. 30, 2021
USD ($)
segment
Jun. 30, 2020
USD ($)
Dec. 31, 2019
employee
Business Acquisition [Line Items]              
Ownerhsip interest in American DG New York, LLC (percent)   51.00%     51.00%    
Number of business segments | segment         2    
Decrease in gross receipts in quarter (percent)       20.00%      
Average number of employees | employee             100
Employee retention credit | $   $ 713,268 $ 0   $ 713,268 $ 0  
American DG Energy, Inc.              
Business Acquisition [Line Items]              
Ownership interest (percent) 100.00%