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Property, Plant and Equipment - Construction in progress (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Property, Plant and Equipment    
Construction in progress $ 20,015 $ 13,650
Sp1 Capital Projects    
Property, Plant and Equipment    
Construction in progress 3,797 2,298
SP2 - Increased scale electrolyte production    
Property, Plant and Equipment    
Construction in progress $ 16,218 $ 11,352