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) - USD ($)
3 Months Ended 6 Months Ended
May 18, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]          
Energy production   $ 1,508,225 $ 774,192 $ 3,290,760 $ 774,192
Revenue   8,453,165 7,590,540 18,628,592 14,437,305
Gross profit   3,159,594 $ 2,986,622 6,997,397 $ 5,901,293
American DG Energy, Inc.          
Business Acquisition [Line Items]          
Ownership interest (percent) 100.00%        
Gross profit   $ 668,504   $ 1,305,384