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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]      
Revenue $ 2,738 $ 372  
Deferred revenue, current 5,555   $ 2,546
Accounts receivable, net 1,039   1,990
Related party      
Related Party Transaction [Line Items]      
Revenue 524 1  
Energy Warehouse Sales | Related party      
Related Party Transaction [Line Items]      
Revenue 500    
Deferred revenue, current 0   $ 1
Accounts receivable, net 55    
Energy Storage Systems Sales | Related party      
Related Party Transaction [Line Items]      
Revenue   $ 1  
Honeywell ACS Ventures LLC | Related party      
Related Party Transaction [Line Items]      
Prepayment of equipment 14,400    
Deferred revenue, non-current - related parties $ 700