Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment - Summary of Property and Equipment (Details)

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Property, Plant and Equipment - Summary of Property and Equipment (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 14,621,566 $ 14,443,685
Less - accumulated depreciation and amortization (2,573,083) (2,177,974)
Property and equipment, net, before construction in progress 12,048,483 12,265,711
Energy systems    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 12,548,796 12,466,642
Energy systems | Minimum    
Property, Plant and Equipment [Line Items]    
Useful life - years 1 year  
Energy systems | Maximum    
Property, Plant and Equipment [Line Items]    
Useful life - years 15 years  
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,284,203 1,215,951
Machinery and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful life - years 5 years  
Machinery and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful life - years 7 years  
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 104,317 205,320
Useful life - years 5 years  
Computer software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 233,478 115,253
Computer software | Minimum    
Property, Plant and Equipment [Line Items]    
Useful life - years 3 years  
Computer software | Maximum    
Property, Plant and Equipment [Line Items]    
Useful life - years 5 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 450,772 $ 440,519