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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Summary of Contract Liabilities A summary of contract liabilities is as follows:
     As of  
     December 31, 2020      June 30, 2021  
     RMB      RMB      US$  
Contract liabilities
      71,141        70,166        10,867