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Short-Term Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Short Term Investments
     December 31  
     2015      2016  
     US$      US$  

Trading securities

      681        3,302  

Held-to-maturity investments

      4,000        —    
  

 

 

     

 

 

  
     4,681        3,302