Quarterly report pursuant to Section 13 or 15(d)

Acquisition of American DG Energy, Inc. - Pro Forma Information (Details)

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Acquisition of American DG Energy, Inc. - Pro Forma Information (Details) - American DG Energy, Inc. - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]    
Total revenues $ 8,303,268 $ 16,579,392
Net income (loss) $ (833,148) $ (1,294,083)
Basic and diluted loss per share (in USD per share) $ (0.04) $ (0.06)