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Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Assets Measured at Fair Value on Recurring Basis
The following table presents our assets measured at fair value on a recurring basis as of December 31, 2019:
December 31, 2019
 
    
Level 1
    
Level 2
    
Level 3
    
Total
 
    
US$
    
US$
    
US$
    
US$
 
Assets
                                   
Short-term investments — trading securities
     —          2,010        —          2,010