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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]            
Revenue $ 359   $ 1,545 $ 3,445 $ 4,744  
Deferred revenue, current 6,034     6,034   $ 2,546
Accounts receivable, net 413     413   1,990
Related party            
Related Party Transaction [Line Items]            
Revenue 4   1 534 3  
Energy Warehouse Sales | Related party            
Related Party Transaction [Line Items]            
Revenue 4     500    
Deferred revenue, current 40     40   1
Accounts receivable, net 18     18   29
Energy Storage Systems Sales | Related party            
Related Party Transaction [Line Items]            
Revenue     $ 1   $ 3  
Honeywell ACS Ventures LLC | Related party            
Related Party Transaction [Line Items]            
Prepayment of equipment   $ 600   14,400    
Deferred revenue, non-current - related parties $ 700     700   $ 700
Amortization       $ 27