Quarterly report pursuant to Section 13 or 15(d)

Related party transactions (Details)

v3.19.1
Related party transactions (Details) - USD ($)
May 04, 2018
Mar. 27, 2018
Mar. 31, 2019
May 19, 2016
TTcogen, LLC        
Schedule of Equity Method Investments [Line Items]        
Equity interest in joint venture (percent)       50.00%
Tedom a.s.        
Schedule of Equity Method Investments [Line Items]        
Equity interest in joint venture (percent)       50.00%
Tedom USA        
Schedule of Equity Method Investments [Line Items]        
Equity interest in joint venture (percent)       50.00%
Initial payment to acquire Tedom USA's membership interest in TTcogen   $ 1    
Payment to acquire Tedom USA'a initial investment in TTcogen, minus certain adjustments   72,597    
Payment for acquisition of assets   $ 72,598    
Co-Chief Executive Officer        
Schedule of Equity Method Investments [Line Items]        
Loan from related party     $ 850,000  
Repayment of loan $ 919,590      
Notes Payable | Co-Chief Executive Officer        
Schedule of Equity Method Investments [Line Items]        
Stated interest rate (percent)     6.00%