Quarterly report pursuant to Section 13 or 15(d)

Related party transactions (Details)

v3.19.2
Related party transactions (Details) - USD ($)
6 Months Ended
May 04, 2018
Mar. 27, 2018
Jun. 30, 2019
Jun. 30, 2018
May 19, 2016
Schedule of Equity Method Investments [Line Items]          
Repayment of loan     $ 0 $ 850,000  
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%