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Related party transactions (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]    
Accounts payable outstanding $ 403,839 $ 163,947
PERC Water Corporation    
Related Party Transaction [Line Items]    
Purchases of services 2,695,000 438,000
Accounts payable outstanding 404,000 164,000
Amount of expense related to sublease agreement $ 97,000 $ 77,000