SHARE-BASED COMPENSATION - Schedule of share options activities (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Number of shares
Outstanding, Beginning balance	13,570,227
Granted	2,674,523
Forfeited	(4,193,612)
Exercised	0	0
Outstanding, Ending balance	12,051,138	13,570,227
Vested and expected to vest	12,051,138
Exercisable	12,028,990
Weighted average exercise price
Outstanding, Beginning balance	$ 2.89
Granted	2.89
Forfeited	2.89
Outstanding, Ending balance	2.89	$ 2.89
Vested and expected to vest	2.89
Exercisable	2.89
Weighted average grant-date fair value
Outstanding, Beginning balance	2.31
Granted	0.82
Forfeited	2.36
Outstanding, Ending balance	2.05	$ 2.31
Vested and expected to vest	2.05
Exercisable	$ 2.05
Weighted remaining contractual years
Weighted remaining contractual years	7 years 9 months 14 days	8 years 4 months 20 days
Vested and expected to vest	7 years 9 months 14 days
Exercisable	7 years 9 months 14 days
Aggregate intrinsic value
Outstanding, Beginning balance	$ 27,354
Outstanding, Ending balance		$ 27,354

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The weighted-average grant date fair value as of the balance sheet date currently exercisable under the stock option plan.

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Weighted-average grant date fair value of options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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The weighted average grant-date fair value of options outstanding during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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