Quarterly report pursuant to Section 13 or 15(d)

Description of business and summary of significant accounting policies - Revenue by Product Line and Services (Details)

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Description of business and summary of significant accounting policies - Revenue by Product Line and Services (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue by Producks and Services [Line Items]        
Products $ 3,345,571 $ 2,007,926 $ 6,883,446 $ 3,952,702
Services 3,038,260 2,531,931 5,603,819 4,802,912
Total revenues 6,383,831 4,539,857 12,487,265 8,755,614
Cogeneration        
Revenue by Producks and Services [Line Items]        
Products 2,526,812 1,419,581 5,098,740 2,573,850
Chiller        
Revenue by Producks and Services [Line Items]        
Products 818,759 588,345 1,784,706 1,378,852
Service Contracts [Member]        
Revenue by Producks and Services [Line Items]        
Services 2,035,041 1,921,875 3,907,407 3,694,856
Installations [Member]        
Revenue by Producks and Services [Line Items]        
Services $ 1,003,219 $ 610,056 $ 1,696,412 $ 1,108,056