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Long-term Investments - Impairment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Long-term Investments |  |  |
Investment related impairment | $ 23,642 | $ 71,081 | $ 106,800
Intangible assets writeoff | 15,400 | 15,400 |
Impairment charges |  | $ 14,200 |
Online education company |  |  |
Long-term Investments |  |  |
Impairment charges | $ 15,900 |  |
Yixia Tech |  |  |
Long-term Investments |  |  |
Investment related impairment |  |  | $ 75,300

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