Annual report [Section 13 and 15(d), not S-K Item 405]

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

v3.25.1
Property, plant and equipment - Summary of Property and Equipment (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 5,733,242 $ 5,427,445
Less: accumulated depreciation and amortization (3,995,206) (4,264,868)
Net property, plant and equipment $ 1,738,036 1,162,577
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 $ 2,810,232 2,810,232
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 $ 1,598,538 1,744,596
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 $ 224,868 212,963
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] $ 906,739 $ 466,789
[1] Lesser of estimated useful life of asset or lease term