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Related party transactions (Details) - USD ($)	3 Months Ended
Related party transactions (Details) - USD ($)	Mar. 31, 2023	Mar. 31, 2022	Jan. 31, 2023	Jan. 04, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Accounts payable outstanding	$ 0				$ 403,839
PERC Water Corporation
Related Party Transaction [Line Items]
Purchases of services		$ 839,000
Accounts payable outstanding					$ 404,000
Amount of expense related to sublease agreement	$ 24,000
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%