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TAXATION - Reconciliation (Details) - China	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation between total income tax expense and the amount computed by applying the weighted average statutory income tax rate to income before income taxes
PRC statutory income tax rate	25.00%	25.00%	25.00%
Impact of different tax rates in other jurisdictions	(1.00%)	(8.00%)	(2.00%)
Tax effect of preferential tax rate for small enterprises	5.00%	(5.00%)	0.00%
Tax effect of non-deductible expenses	29.00%	(2.00%)	9.00%
Tax effect of non-taxable income	19.00%	2.00%	(9.00%)
Tax effect of tax-exempt entities	(20.00%)	17.00%	0.00%
Tax effect of deemed profit	0.00%	0.00%	(2.00%)
Tax effect of short term investment	0.00%	0.00%	3.00%
Deferred tax effect of tax rate change	47.00%	(35.00%)	0.00%
Changes in valuation allowance	(106.00%)	(9.00%)	(16.00%)
Effective tax rate	(2.00%)	(15.00%)	8.00%

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- Definition

Percentage of effective income tax rate, non-deductible expense.

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Percentage of preferential tax rate on small enterprises.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deemed profit.

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Represents the portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income of the entities that is exempt from income taxes under enacted tax laws.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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