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TAXATION - Reconciliation (Details) - China | 12 Months Ended
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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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