Annual report pursuant to Section 13 and 15(d)

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

v3.22.0.1
Property, plant and equipment - Summary of Property and Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 5,872,993 $ 5,811,893
Less: accumulated depreciation and amortization (4,090,049) (3,528,047)
Net property, plant and equipment $ 1,782,944 2,283,846
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 $ 3,556,488 3,526,514
Energy systems | Minimum    
Property, Plant and Equipment [Line Items]    
Useful life - years 10 years  
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 $ 1,463,153 1,448,024
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 $ 193,698 193,698
Useful life - years 5 years  
Computer software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 192,865 192,865
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] $ 466,789 $ 450,792
[1] Lesser of estimated useful life of asset or lease term