v3.26.1
Principal Accounting Policies - Schedule of assets and liabilities that are measured at fair value on a recurring basis (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value of Level 3 investments as beginning balance $ 6,921 $ 9,874
Disposal   (2,706)
The change in fair value of the investments 286 (247)
Fair value of Level 3 investments as ending balance 7,207 6,921
Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets $ 68,719 $ 64,641
Recurring basis | Expected volatility | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Unobservable Inputs 0.33 0.40
Recurring basis | Expected volatility | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Unobservable Inputs 0.73 0.71
Recurring basis | Probability - Liquidation scenario | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Unobservable Inputs 0.38 0.38
Recurring basis | Probability - Liquidation scenario | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Unobservable Inputs 40 0.45
Recurring basis | Probability - Redemption scenario | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Unobservable Inputs 0.38 0.38
Recurring basis | Probability - Redemption scenario | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Unobservable Inputs 40 0.45
Recurring basis | Probability - IPO scenario | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Unobservable Inputs 0.20 0.10
Recurring basis | Probability - IPO scenario | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Unobservable Inputs 25 0.25
Recurring basis | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets $ 61,270 $ 57,525
Recurring basis | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 7,449 7,116
Recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 2,938 2,117
Recurring basis | Level 1 | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 2,938 2,117
Recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 58,574 55,603
Recurring basis | Level 2 | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 58,332 55,408
Recurring basis | Level 2 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 242 195
Recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 7,207 6,921
Recurring basis | Level 3 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets $ 7,207 $ 6,921