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Discontinued Operations (Comprehensive Income Information of Discontinued Operations) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Sep. 23, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Discontinued Operations [Line Items] |  |  |  |  |  |
Net income/(loss) from discontinued operations, net of tax |  |  | $ 864,902,000 |  | $ (91,793,000) | $ 55,108,000
Sogou [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues |  |  | 407,607,000 | [1] | 924,664,000 | 1,172,252,000
Cost of revenues |  |  | 274,408,000 | [1] | 722,614,000 | 738,454,000
Gross profit/(loss) |  |  | 133,199,000 | [1] | 202,050,000 | 433,798,000
Operating expenses: |  |  | 206,841,000 | [1] | 325,170,000 | 369,363,000
Operating profit/(loss) |  |  | (73,642,000) | [1] | (123,120,000) | 64,435,000
Interest income |  |  | 2,377,000 | [1] | 2,807,000 | 4,443,000
Interest expense |  |  | (761,000) | [1] | 0 | 0
Foreign currency exchange gain/(loss) |  |  | (848,000) | [1] | (7,767,000) | 1,849,000
Other income/(expense), net |  |  | 81,655,000 | [1] | 38,633,000 | 21,127,000
Income/(loss) from discontinued operations before income tax expense |  |  | 8,781,000 | [1] | (89,447,000) | 91,854,000
Income tax expense/(benefit) |  |  | (1,112,000) | [1] | 2,346,000 | 2,748,000
Results of operations from discontinued operations, net of tax |  |  | 9,893,000 | [1] | (91,793,000) | 89,106,000
Gain on disposal of discontinued operations |  | $ 855,000,000 | 855,009,000 | [1] | 0 | 0
Net income/(loss) from discontinued operations, net of tax |  |  | 864,902,000 | [1] | (91,793,000) | 89,106,000
Sogou [Member] | Research and Development Expense [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Operating expenses: | [2] |  | 141,506,000 | [1] | 193,376,000 | 190,402,000
Sogou [Member] | Sales and marketing [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Operating expenses: | [2] |  | 53,481,000 | [1] | 102,523,000 | 138,291,000
Sogou [Member] | General and administrative [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Operating expenses: | [2] |  | $ 11,854,000 | [1] | 29,271,000 | 40,670,000
Changyou [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on disposal of discontinued operations |  |  |  |  | $ 0 | 0
Changyou [Member] | Shanghai Jingmao Culture Communication Co., Ltd. ("Shanghai Jingmao") and its affiliate [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues | [3] |  |  |  |  | 37,323,000
Cost of revenues | [3] |  |  |  |  | 43,857,000
Gross profit/(loss) | [3] |  |  |  |  | (6,534,000)
Operating expenses: | [3] |  |  |  |  | 27,390,000
Operating profit/(loss) | [3] |  |  |  |  | (33,924,000)
Interest income | [3] |  |  |  |  | 7,000
Other income/(expense), net | [3] |  |  |  |  | 61,000
Income/(loss) from discontinued operations before income tax expense | [3] |  |  |  |  | (33,856,000)
Income tax expense/(benefit) | [3] |  |  |  |  | 142,000
Net income/(loss) from discontinued operations, net of tax | [3] |  |  |  |  | (33,998,000)
Changyou [Member] | Shanghai Jingmao Culture Communication Co., Ltd. ("Shanghai Jingmao") and its affiliate [Member] | Sales and marketing [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Operating expenses: | [3] |  |  |  |  | 8,807,000
Changyou [Member] | Shanghai Jingmao Culture Communication Co., Ltd. ("Shanghai Jingmao") and its affiliate [Member] | General and administrative [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Operating expenses: | [3] |  |  |  |  | $ 18,583,000
[1] | Includes the financial results of the discontinued operations from January 1, 2021 to September 23, 2021.
[2] | Expenses generated from marketing services among the Sohu and Sogou, and leasing expenses generated from a building that Sohu leases to Sogou are not eliminated because those expenses are considered to continue after the disposal of the discontinued operations.
[3] | Includes the financial results of the discontinued operations from January 1, 2019 to August 12, 2019.

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