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INCOME TAX - Summary (Details) - HKD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2018
United States
INCOME TAX
Statutory income tax (as a percent)		21.00%
Indonesia
INCOME TAX
Statutory income tax (as a percent)		25.00%
Hong Kong SAR
INCOME TAX
Statutory income tax (as a percent)		16.50%
Withholding taxes on remittance of dividends		$ 0
Threshold profit taxed at half of the current tax rate under two-tiered profits tax rates regime					$ 2
Tax rate at half of the current tax rate under two-tiered profits tax rates regime					8.25%
PRC
INCOME TAX
Statutory income tax (as a percent)		25.00%
PRC | Beijing Niudian
INCOME TAX
Preferential tax rate		15.00%	15.00%
PRC | Forecast | Beijing Niudian
INCOME TAX
Preferential tax rate	15.00%
PRC | Jiangsu Xiaoniu
INCOME TAX
Preferential tax rate		15.00%	15.00%	15.00%

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- Definition

Percentage of tax rate at half of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of preferential tax rate applicable to pretax income (loss).

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Represents the profit taxed at half of the current tax rate under two-tiered profits tax rates regime.

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- Definition

Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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