SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) obligation segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Revenue, Major Customer [Line Items]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Allowance for doubtful accounts	$ 0	$ 0
Impairment of long-lived assets	$ 0	0	$ 0
Number of performance obligations | obligation	2
Basic vehicle warranty term	4 years
Revenue	$ 608,181,000	27,111,000	$ 3,976,000
Vehicle Sales With RVG
Revenue, Major Customer [Line Items]
Revenue	31,100,000
Vehicle Sales With OTA and Remarketing
Revenue, Major Customer [Line Items]
Deferred revenue	$ 15,400,000	$ 0