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Accounting policies - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 04, 2023 USD ($) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 customer
Interest Capitalized |  | $ 0 | $ 0 |
PERC Water Corporation | Subsequent Event [Member] |  |  |  |
Ownership interest held | 100.00% |  |  |
Cash | $ 2,400,000 |  |  |
Aerex |  |  |  |
Number of Customers | customer |  |  |  | 1
Aerex | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |
Percentage of total |  |  |  | 80.00%
Aerex | Gross Profit [Member] | Customer Concentration Risk [Member] |  |  |  |
Percentage of total |  |  |  | 89.00%
PERC Water Corporation |  |  |  |
Ownership interest acquired | 39.00% |  |  |
Cash | $ 7,800,000 |  |  |
PERC Water Corporation | Subsequent Event [Member] |  |  |  |
Ownership interest acquired | 39.00% |  |  |
Shares of the Company's common stock | shares | 368,383 |  |  |
Cash | $ 2,400,000 |  |  |

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