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Sales, Contract Assets and Contract Liabilities (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Revenue $ 190,000 $ 0 $ 553,000 $ 0  
Cost of goods sold 278,000 $ 180,000 1,008,000    
Cost of goods sold, warranty adjustment     86,000    
Accrual adjustments     8,000    
Contract assets 0   0   $ 92,000
Contract liabilities 0   0   $ 94,000
Cost of goods sold, estimated loss upon completion     712,000    
Year 2016 and 2017          
Cost of goods sold, warranty adjustment       $ 153,000  
Number of projects to expire product warranties       6  
Burner Contract          
Cost of goods sold, loss related to the delivery and sale 96,000        
Cost of goods sold, estimated loss upon completion $ 182,000   $ 390,000