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Basis of presentation and consolidation and significant accounting policies (Tables)
 9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]  
Summary of assets and liabilities that are measured at fair value on a recurring basis As of September 30, 2021, information about inputs into the fair value measurement of the Group’s assets that are measured at a fair value on a recurring basis in periods subsequent to their initial recognition is as follows:
 
Description
   
Fair Value as of
September 30, 2021
US$
     
Fair Value Measurement at Reporting
Date Using Quoted Prices in Active
Markets
for Identical
Assets (Level 1)
US$
  
Equity Investments with Readily Determinable Fair Value
      20,070        20,070