SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) segment obligation	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Revenue, Major Customer [Line Items]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Impairment Long Lived Asset Held For Use Statement of Income or Comprehensive Income Extensible Enumeration Not Disclosed Flag	impairment loss
Impairment of long-lived assets	$ 0	$ 15,300	$ 0
Number of performance obligations | obligation	2
Basic vehicle warranty term	4 years
Revenue	$ 807,832	595,271	608,181
Maximum amount of future payments	401,100	101,100
Supplier recovery	50,000
Advertising expense	49,800	35,300	0
Vehicle Sales With RVG
Revenue, Major Customer [Line Items]
Revenue	442,700	190,900	$ 31,100
RVG, liabilities	58,000	0
Vehicle Sales With OTA and Remarketing
Revenue, Major Customer [Line Items]
Deferred revenue	53,300	28,700
Vehicle Sales With OTA and Remarketing | Other current liabilities
Revenue, Major Customer [Line Items]
Deferred revenue	18,500	7,700
Vehicle Sales With OTA and Remarketing | Other Noncurrent Liabilities
Revenue, Major Customer [Line Items]
Deferred revenue	$ 34,800	$ 21,000
Electric Vehicle Purchase Agreement | Customer Concentration Risk | Accounts Receivable | Government of Saudi Arabia
Revenue, Major Customer [Line Items]
Concentration risk (as a percent)	51.70%	68.50%