Annual report pursuant to Section 13 and 15(d)

Revolving line of credit, Convertible debentures and loan due to related party (Details)

v3.20.1
Revolving line of credit, Convertible debentures and loan due to related party (Details)
12 Months Ended
May 04, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 18, 2017
USD ($)
Debt Instrument [Line Items]        
Payment made to terminate senior convertible promissory note   $ 0 $ 850,000  
Chief Executive Officer (John N. Hatsopoulos)        
Debt Instrument [Line Items]        
Loan from related party       $ 850,000
Payment made to terminate senior convertible promissory note $ 919,590      
Demand notes | Chief Executive Officer (John N. Hatsopoulos)        
Debt Instrument [Line Items]        
Stated interest rate (percent)       6.00%
Webster Business Credit Corporation        
Debt Instrument [Line Items]        
Stated interest rate (percent)   6.25%    
Credit facility, maximum borrowing capacity $ 10,000,000      
Fixed charge coverage ratio 1.10      
Annual financial capital expenditure limit $ 500,000      
Debt issuance costs $ 145,011      
Amortization period for debt issuance costs 3 years      
Line of credit outstanding   $ 2,452,330 2,122,221  
Line of credit, debt issuance costs   $ 49,946 $ 112,786  
One Month LIBOR | Webster Business Credit Corporation        
Debt Instrument [Line Items]        
Basis spread on variable rate 3.00%      
Lender's Base Rate | Webster Business Credit Corporation        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.50%      
Federal Funds Rate | Webster Business Credit Corporation        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.50%      
Lender's Base Rate - One Month LIBOR | Webster Business Credit Corporation        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.75%