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Accounts Receivable, Net (Tables)
 6 Months Ended
Jun. 30, 2022
Credit Loss, Additional Improvements [Abstract]  
Schedule of accounts receivable and allowance for doubtful accounts
   As of
December 31,		   As of June 30, 
   2021   2022   2022 
   RMB   RMB   USD 
Accounts receivable   208,522    383,814    57,302 
Less: allowance for doubtful accounts   (2,215)   (5,362)   (801)
Accounts receivable, net   206,307    378,452    56,501 

 
Schedule of analysis of the allowance for doubtful accounts
   As of
December 31,		   As of June 30, 
   2021   2022   2022 
   RMB   RMB   USD 
Balance, beginning of year   3,813    2,215    331 
Additions (recovery)   (1,592)   3,094    462 
Exchange difference   (6)   53    8 
Balance, end of year   2,215    5,362    801