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Revenue, Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Revenues $ 50 $ 324 $ 54 $ 190 $ 0 $ 363 $ 374 $ 607
Cost of goods sold             258 1,059
Cost of goods sold, estimated loss upon completion             41  
Reversal of accruals for product warranties that expired               86
Contract assets 20   39       20 39
Contract liabilities $ 247   $ 84       $ 247 84
Burner Contract                
Cost of goods sold               433
Cost of goods sold, estimated loss upon completion               $ 712