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Principal Accounting Policies - Fair Value of Assets and Liabilities (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Short-Term Financial Products Issued By Banks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   $ 84,853
Short-Term Financial Products and Structured Deposits Issued by Banks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 71,464  
Short-Term Investments, Equity Investment in a Publicly Traded Security    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 2,787 7,983
Long-Term Financial Products Issued by Banks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 61,400 20,000
Level 1 | Short-Term Investments, Equity Investment in a Publicly Traded Security    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 2,787 7,983
Level 2 | Short-Term Financial Products Issued By Banks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   84,853
Level 2 | Short-Term Financial Products and Structured Deposits Issued by Banks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 71,464  
Level 2 | Long-Term Financial Products Issued by Banks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 61,400 $ 20,000