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Related party transactions (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Jan. 31, 2023 | Jan. 04, 2023 | Dec. 31, 2020 | Dec. 31, 2019
PERC Water Corporation |  |  |  |  |  |
Related party transactions |  |  |  |  |  |
Purchases of services | $ 2,695,000 |  |  |  |  |
Amount of expense related to sublease agreement |  | $ 97,000 |  |  |  |
PERC Water Corporation |  |  |  |  |  |
Related party transactions |  |  |  |  |  |
Ownership interest held |  |  |  | 100.00% |  |
PERC Water Corporation |  |  |  |  |  |
Related party transactions |  |  |  |  |  |
Ownership interest acquired |  |  | 39.00% | 39.00% | 61.00% | 61.00%

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