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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