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Related party transactions (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Accounts payable outstanding $ 204,285   $ 204,285   $ 200,558
PERC Water Corporation          
Related Party Transaction [Line Items]          
Purchases of services 105,000 $ 361,000 390,000 $ 1,226,000  
Accounts payable outstanding 204,000   204,000   $ 201,000
Amount of expense related to sublease agreement $ 24,000   $ 53,000