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ENERGY STORAGE SYSTEMS, NET - Schedule of Energy Storage Systems, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Less: accumulated depreciation $ (60,586) $ (58,782)
Total energy storage systems, net 87,750 90,757
Energy storage systems placed into service    
Property, Plant and Equipment [Line Items]    
Total energy storage systems, gross 141,975 143,154
Energy storage systems not yet placed into service    
Property, Plant and Equipment [Line Items]    
Total energy storage systems, gross $ 6,361 $ 6,385