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Related party transactions (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Accounts payable outstanding $ 278,739   $ 278,739   $ 200,558
PERC Water Corporation          
Related Party Transaction [Line Items]          
Purchases of services 129,000 $ 371,000 285,000 $ 865,000  
Accounts payable outstanding 279,000,000 $ 201,000,000 279,000,000 $ 201,000,000  
Amount of expense related to sublease agreement $ 24,000   $ 29,000