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Related party transactions (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |
Accounts payable outstanding | $ 247,008 |  | $ 200,558
PERC Water Corporation |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases of services | 156,000,000 | $ 493,000,000 |
Accounts payable outstanding | 247,000,000 |  |
Amount of expense related to sublease agreement | $ 4,000,000 |  |

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