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v3.21.1

INCOME TAX - Reconciliation of statutory tax rate and effective tax rate (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of the differences between actual income tax expense and the PRC statutory tax rate |  |  |
PRC enterprise income tax rate | 25.00% | 25.00% | 25.00%
Non-PRC resident enterprises not subject to income tax | (27.60%) | (21.40%) | (9.20%)
Tax differential for entities in non-PRC jurisdiction | (1.30%) | (1.40%) | (1.20%)
Preferential tax rate | (0.30%) | 0.00% | 0.00%
Tax effect of current year permanent differences | 1.00% | 1.50% | (1.30%)
Expiration of unused net operating losses | (1.30%) | (1.40%) | (10.10%)
Non-taxable income | 2.50% | 0.00% | 0.00%
Change in valuation allowance | (21.30%) | (8.70%) | (1.00%)
Return to provision adjustment | 1.30% | 2.70% | (0.10%)
Effective tax rate (as a percent) | (22.00%) | (3.70%) | 2.10%

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- Definition 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 expiration of unused net operating losses. + References No definition available. + Details
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- Definition 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 nontaxable foreign entities. + References No definition available. + Details
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