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Subsequent events (Details) - Definitive Agreement With Water Authority-Cayman(WAC) - Subsequent Event [Member]
gal in Thousands
May 10, 2022
May 06, 2022
item
gal
Subsequent Event [Line Items]    
Definitive agreement, initial term 18 months  
Definitive agreement, subsequent operation and maintenance period   10 years
Number of reverse osmosis trains | item   2
Maximum [Member]    
Subsequent Event [Line Items]    
Plant production capacity per day | gal   2,640