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Description of business and summary of significant accounting policies - Revenue by Product Line and Services (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Revenue by Producks and Services [Line Items] | ||||
| Products | $ 779,455 | $ 1,354,013 | $ 3,639,974 | $ 4,191,439 |
| Services | 2,113,785 | 1,698,543 | 6,103,044 | 5,498,545 |
| Total revenues | 2,893,240 | 3,052,556 | 9,743,018 | 9,689,984 |
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Cogeneration
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| Revenue by Producks and Services [Line Items] | ||||
| Products | 706,098 | 1,070,013 | 2,441,740 | 2,687,769 |
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Chiller
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| Revenue by Producks and Services [Line Items] | ||||
| Products | $ 73,357 | $ 284,000 | $ 1,198,234 | $ 1,503,670 |
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- Details
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- Definition
Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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