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Long-term Investments - Impairment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Long-term Investments |  |  |
Investment-related impairment and provision | $ 5,972 | $ 93,382 | $ 23,642
Online education company |  |  |
Long-term Investments |  |  |
Impairment writeoff |  |  | $ 15,900
Hydrogen-powered autonomous trucks manufacturing |  |  |
Long-term Investments |  |  |
Impairment writeoff |  | 30,000 |
Commercial property investment |  |  |
Long-term Investments |  |  |
Impairment writeoff |  | $ 49,000 |
Online literature business |  |  |
Long-term Investments |  |  |
Impairment writeoff | $ 3,700 |  |

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