SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment obligation	Jun. 30, 2024 USD ($)
Revenue, Major Customer [Line Items]
Number of operating segments | segment					1
Number of reportable segments | segment					1
Revenue			$ 259,432	$ 200,581	$ 494,480	$ 373,321
Number of performance obligations | obligation					2
Basic vehicle warranty term					4 years
RVG liabilities	$ 26,737	$ 17,755	26,737		$ 26,737
Maximum amount of future payments	524,600	401,100	524,600		524,600
Vehicle Sales Without RVG
Revenue, Major Customer [Line Items]
Revenue			64,300	81,900	99,500	149,400
Vehicle Sales with RVG
Revenue, Major Customer [Line Items]
Revenue			132,800	118,700	265,900	190,900
RVG liabilities	77,300	58,000	77,300		77,300
Vehicle Sales with OTA and Remarketing
Revenue, Major Customer [Line Items]
Deferred revenue	65,600	53,300	65,600		65,600
Vehicle Sales with OTA and Remarketing | Other Current Liabilities
Revenue, Major Customer [Line Items]
Deferred revenue	23,900	18,500	23,900		23,900
Vehicle Sales with OTA and Remarketing | Other Noncurrent Liabilities
Revenue, Major Customer [Line Items]
Deferred revenue	$ 41,700	$ 34,800	41,700		41,700
Regulatory Credit
Revenue, Major Customer [Line Items]
Revenue			18,700	12,100	50,200	17,500
Sale and Leaseback Transactions
Revenue, Major Customer [Line Items]
Revenue			$ 19,000	$ 300	$ 44,900	$ 6,800
Government of Saudi Arabia | Electric Vehicle Purchase Agreement | Accounts Receivable | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk (as a percent)	50.70%	51.70%