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Concentrations and Associated Credit Risk (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenues [Member] |
Concentration Risk [Line Items] |
Schedule of concentration risk |
|  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |
Con Edison |  |  | 12 | % |  |  | 16 | %
ComEd |  |  | na |  |  |  | 11 | %
na-less than 10% of consolidated revenue in the period
Accounts receivable [Member] |
Concentration Risk [Line Items] |
Schedule of concentration risk |
|  | September 30, 2018 |  |  | December 31, 2017 |
Con Edison |  |  | 12 | % |  |  | 11 | %

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