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Discontinued Operations - Schedule Of Effective Income tax Rate Of Discontinued Operations (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Discontinued Operations Tax Rate Reconciliation |  |  |  |
Statutory Rate: | 25.00% |  | 25.00% | 25.00%
Sogou [Member] |  |  |  |
Effective Income Tax Rate Discontinued Operations Tax Rate Reconciliation |  |  |  |
Statutory Rate: | 25.00% | [1],[2] | 25.00% | 25.00%
Effect of tax holidays applicable to subsidiaries and consolidated VIEs | 127.00% | [1],[2] | (18.00%) | (2.00%)
Tax differential from statutory rate applicable to subsidiaries and consolidated VIEs | (90.00%) | [1],[2] | (3.00%) | 3.00%
Changes in valuation allowance for deferred tax assets | 349.00% | [1],[2] | (43.00%) | 7.00%
Research and development super-deduction and other permanent book-tax differences | (249.00%) | [1],[2] | 35.00% | (25.00%)
Capital gains from equity investments | (175.00%) | [1],[2] | 1.00% | (5.00%)
Effective Income Tax Rate Discontinued Operations | (13.00%) | [1],[2] | (3.00%) | 3.00%
[1] | Includes the financial results of the discontinued operations from January 1, 2021 to September 23, 2021.
[2] | The changes in the effective tax rate for the period ended September 23, 2021 resulted from the lower income from discontinued operations before income tax expense.

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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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