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Taxation - Reconciliation of differences between statutory and effective income tax rates (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of the differences between the statutory income tax rate and the Group's effective income tax rate |  |  |
Statutory income tax rate | 25.00% | 25.00% | 25.00%
Permanent differences | (5.00%) | (2.70%) | (1.90%)
Effect due to different tax rates applicable to overseas entities | 0.20% | (1.80%) | (0.50%)
Effect of lower tax rate applicable to Software Enterprises, Key Software Enterprise and HNTEs | (10.10%) | (10.10%) | (16.50%)
Change in valuation allowance | 1.80% | 3.90% | 6.80%
Effect of withholding income tax | 8.80% | 5.30% | 6.90%
Effective income tax rate | 20.70% | 19.60% | 19.80%

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- Definition Represents the portion of the difference between the effective income tax rate and foreign statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets. + References No definition available. + Details
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- Definition Represents the portion of the difference between the effective income tax rate and foreign statutory income tax rate attributable to nondeductible expenses and nontaxable income under enacted tax laws or differences in the methodologies used to determine income and/or expense amounts for financial statements prepared in accordance with generally accepted accounting principles. + References No definition available. + Details
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- Definition Represents the portion of the difference between the effective income tax rate and foreign statutory income tax rate on income attributable to withholding income tax accrued for cash expected to be repatriated from onshore to offshore. + References No definition available. + Details
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- Definition The portion of the effective income tax rate attributable to the difference, between income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the unified statutory income tax rates to pretax income from continuing operations of the entity's subsidiaries and VIEs, which are qualified as high and new technology, and advanced technology enterprises. + References No definition available. + Details
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- Definition Represents the statutory corporate income tax rate in the foreign jurisdiction. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 + Details
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