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Related party transactions (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jan. 31, 2023
Jan. 04, 2023
Dec. 31, 2020
Dec. 31, 2019
PERC Water Corporation            
Related party transactions            
Purchases of services $ 2,695,000          
Amount of expense related to sublease agreement   $ 97,000        
PERC Water Corporation            
Related party transactions            
Ownership interest held       100.00%    
PERC Water Corporation            
Related party transactions            
Ownership interest acquired     39.00% 39.00% 61.00% 61.00%