SHARE-BASED COMPENSATION - Nonvested Restricted Shares (Details) - Restricted Stock - Kaixin 2023 and 2024 Plan - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Number of nonvested restricted shares
Balance at the beginning of period	106	106
Granted	3,592,183	115,169
Vested	(3,592,183)	(115,169)
Balance at the end of period	106	106	106
Weighted average fair value per ordinary shares at the granted dates
Balance at the beginning of period	$ 41,922	$ 41,922
Granted	9.8	904.5
Vested	9.8	904.5
Balance at the end of period	$ 41,922	$ 41,922	$ 41,922
Unrecognized share-based compensation expense	$ 1,181
Weighted average period for unrecognized compensation cost	2 years 1 month 6 days
Total fair value of shares vested	$ 25,405	$ 10,856	$ 11,897

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of non-option equity instruments exercised by participants.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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