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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%

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