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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 ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition [Line Items]        
Total revenues $ 8,303,268 $ 6,972,832 $ 16,579,392 $ 13,220,810
Net loss $ (833,148) $ (523,538) $ (1,294,083) $ (1,993,124)
Basic and diluted loss per share (usd per share) $ (0.04) $ (0.02) $ (0.06) $ (0.09)