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Related party transactions (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Jan. 31, 2023 | Jan. 04, 2023 | Dec. 31, 2022
PERC Water Corporation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchases of services | $ 641,000 | $ 1,480,000 |  |  |
Accounts payable outstanding |  |  |  |  | $ 404,000
Amount of expense related to sublease agreement | $ 24,000 | $ 48,000 |  |  |
PERC Water Corporation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Ownership interest acquired |  |  | 39.00% | 39.00% |
PERC Water Corporation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Ownership interest held |  |  |  | 100.00% |

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