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v3.22.1

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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