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Revenue, Contract Assets and Contract Liabilities (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) project	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)
Revenues	$ 0	$ 363
Reversal of accruals for product warranties that expired	$ 51
Number of projects to expire product warranties | project	3
Contract assets	$ 244			$ 39
Contract liabilities	84			$ 84
Residual cost on completed contract			$ 8
Burner Contract
Cost of goods sold	0	$ 250
Loss Contract [Member]
Cost of goods sold	$ 18

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