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EQUITY METHOD INVESTMENTS - Borg Warner Romeo Power LLC (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 04, 2022
Jan. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Jun. 28, 2019
Schedule of Equity Method Investments [Line Items]          
Payments to to fund joint venture     $ 4,000 $ 35,000  
BorgWarner Romeo Power LLC          
Schedule of Equity Method Investments [Line Items]          
Payments to to fund joint venture   $ 4,000 $ 10,000    
BorgWarner Romeo Power LLC | Legacy Romeo          
Schedule of Equity Method Investments [Line Items]          
Percentage of interest in the joint venture         40.00%
BorgWarner Romeo Power LLC | BorgWarner          
Schedule of Equity Method Investments [Line Items]          
Percentage of interest in the joint venture         60.00%
BorgWarner Romeo Power LLC | BorgWarner | BorgWarner | Subsequent Event          
Schedule of Equity Method Investments [Line Items]          
Payments to to fund joint venture $ 28,600        
Increase in joint venture ownership 60.00%