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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 29, 2025
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Stock split ratio, common stock 0.1          
Cash flow improvement opportunities, amount       $ 1,400,000    
Number of operating segments | segment       1    
Number of reportable segments | segment       1    
Revenue   $ 405,347 $ 259,432 $ 687,812 $ 494,480  
Basic vehicle warranty term       4 years    
RVG liabilities   60,201   $ 60,201   $ 55,448
Maximum amount of future payments   724,500   724,500   705,900
Vehicle Sales Without RVG            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Revenue   350,600 $ 222,700 615,300 $ 417,600  
Vehicle Sales with OTA and Remarketing            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Deferred revenue   93,200   93,200   87,500
Vehicle Sales with OTA and Remarketing | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Deferred revenue   29,500   29,500   30,000
Vehicle Sales with OTA and Remarketing | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Deferred revenue   63,700   63,700   57,500
Vehicle Sales with RVG            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
RVG liabilities   $ 131,500   $ 131,500   $ 114,000
Vehicle Sales with RVG | Revenue Benchmark | Product Concentration Risk            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Concentration risk (in percent)   33.00% 51.00% 36.00% 54.00%  
Sale and Leaseback Transactions            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Revenue   $ 16,600 $ 19,000 $ 51,000 $ 44,900  
Regulatory Credit            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Revenue   $ 25,400 $ 18,700 $ 25,400 $ 50,200  
Government of Saudi Arabia | Electric Vehicle Purchase Agreement | Accounts Receivable | Customer Concentration Risk            
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]            
Concentration risk (in percent)       83.60%   68.00%