SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands			3 Months Ended
	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2025 USD ($) segment obligation	Mar. 31, 2024 USD ($)
Revenue, Major Customer [Line Items]
Number of operating segments | segment			1
Number of reportable segments | segment			1
Revenue			$ 235,048	$ 172,740
Number of performance obligations | obligation			2
Basic vehicle warranty term			4 years
Maximum amount of future payments	$ 470,000	$ 401,100	$ 470,000
Vehicle Sales Without RVG
Revenue, Major Customer [Line Items]
Revenue			35,200	67,500
Vehicle Sales with RVG
Revenue, Major Customer [Line Items]
Revenue			133,100	89,500
RVG, liabilities	66,900	58,000	66,900
Vehicle Sales with OTA and Remarketing
Revenue, Major Customer [Line Items]
Deferred revenue	59,100	53,300	59,100
Vehicle Sales with OTA and Remarketing | Other Current Liabilities
Revenue, Major Customer [Line Items]
Deferred revenue	21,600	18,500	21,600
Vehicle Sales with OTA and Remarketing | Other Noncurrent Liabilities
Revenue, Major Customer [Line Items]
Deferred revenue	$ 37,500	$ 34,800	37,500
Regulatory Credit
Revenue, Major Customer [Line Items]
Revenue			31,500	5,400
Sale and Leaseback Transactions
Revenue, Major Customer [Line Items]
Revenue			$ 25,900	$ 6,500
Government of Saudi Arabia | Electric Vehicle Purchase Agreement | Accounts Receivable | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk (as a percent)	59.60%	51.70%