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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue by Producks and Services [Line Items]        
Products $ 1,860,860 $ 1,094,529 $ 8,744,306 $ 5,047,231
Services 2,815,182 3,081,334 8,419,001 7,884,246
Total revenues 4,676,042 4,175,863 17,163,307 12,931,477
Cogeneration        
Revenue by Producks and Services [Line Items]        
Products 1,493,335 626,223 6,592,075 3,200,073
Chiller        
Revenue by Producks and Services [Line Items]        
Products 367,525 468,306 2,152,231 1,847,158
Service Contracts [Member]        
Revenue by Producks and Services [Line Items]        
Services 1,921,897 1,808,154 5,829,304 5,503,010
Installations [Member]        
Revenue by Producks and Services [Line Items]        
Services $ 893,285 $ 1,273,180 $ 2,589,697 $ 2,381,236