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
May 18, 2017
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]      
Revenue   $ 10,175,427 $ 6,846,767
Gross profit   3,837,803 $ 2,914,673
American DG Energy, Inc.      
Business Acquisition [Line Items]      
Ownership interest (percent) 100.00%    
Gross profit   $ 636,880