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Revenue, Contract Assets and Contract Liabilities (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
contract
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
contract
project
Dec. 31, 2021
USD ($)
Revenues $ 0 $ 0 $ 0 $ 363  
Cost of goods sold   505 0 730  
Cost of sales for losses on two contracts   $ 556   $ 574  
Number of contracts | contract   2   2  
Contract assets 486   486   $ 39
Contract liabilities $ 84   $ 84   $ 84
Reversals of accruals for product warranties that expired   $ 35   $ 86  
Residual cost on completed contract   $ 16   $ 8  
Year 2018          
Number of projects to expire product warranties | project       4  
Burner Contract          
Revenues       $ 363  
Cost of goods sold       250  
Cost of goods sold, warranty adjustment       $ 36