SHARE-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2019
SHARE-BASED COMPENSATION
Number of options, Outstanding, Beginning Period	14,518,426	19,742,616	22,226,338
Number of options, Granted	11,920,000		1,010,000		0
Number of options, Forfeited	(1,642,047)	(5,047,307)	(2,537,466)
Number of options, Exercised	(355,543)	(176,883)	(956,256)
Number of options, Outstanding, Ending Period	24,440,836	14,518,426	19,742,616	22,226,338
Number of options, Exercisable	11,504,836
Number of options, Expected to vest	11,642,400
Weighted average exercise price, Outstanding, Beginning Period	$ 0.83	$ 0.81	$ 0.8
Weighted average exercise price, Granted	0.11		1.1
Weighted average exercise price, Forfeited	0.54	0.78	0.98
Weighted average exercise price, Exercised	0.04	0.03	0.44
Weighted average exercise price, Outstanding, Ending Period	0.51	$ 0.83	$ 0.81	$ 0.8
Weighted average exercise price, Exercisable	0.79
Weighted average exercise price, Expected to vest	$ 0.26
Weighted-average remaining contractual life (years), Outstanding	11 years 5 months 4 days	5 years 6 months 29 days	6 years 5 months 26 days	7 years 4 months 28 days
Weighted-average remaining contractual life (years), Exercisable	4 years 3 months 21 days
Weighted-average remaining contractual life (years), Expected to vest	17 years 9 months 7 days
Aggregate intrinsic value, Outstanding	$ 19,794	$ 15,553	$ 22,974	$ 26,813
Aggregate intrinsic value, Exercisable	13,460
Aggregate intrinsic value, Expected to vest	$ 5,700

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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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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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Amount by which current fair value of underlying stock exceeds exercise price of 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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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 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 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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