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Taxation - Summary of Income Tax Reconciliation (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax rate of the PRC | 25.00% | 25.00% | 25.00%
Tax rate difference from preferential tax treatments and statutory rate in other jurisdictions | (16.50%) | (16.30%) | (7.40%)
Effect of withholding taxes | (0.30%) |  |
Permanent differences | 26.60% | 16.90% | 5.60%
Change in valuation allowances | (35.20%) | (26.80%) | (23.20%)
Effective income tax rate | (0.40%) | (1.20%) |

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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 changes in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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