Annual report pursuant to Section 13 and 15(d)

Property, plant and equipment - Summary of Property and Equipment (Details)

v3.19.1
Property, plant and equipment - Summary of Property and Equipment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 14,939,567 $ 14,443,685
Less: accumulated depreciation and amortization (3,666,452) (2,177,974)
Net property, plant and equipment $ 11,273,115 12,265,711
Minimum    
Property, Plant and Equipment [Line Items]    
Useful life - years 3 years  
Maximum    
Property, Plant and Equipment [Line Items]    
Useful life - years 15 years  
Energy systems    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 12,709,990 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 $ 1,355,617 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 $ 222,542 205,320
Useful life - years 5 years  
Computer software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 200,626 115,253
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 [1] $ 450,792 $ 440,519
Certain Energy Production Related Assets    
Property, Plant and Equipment [Line Items]    
Deferred consideration $ 2,000,000  
[1] Lesser of estimated useful life of asset or lease term