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Other Current Assets (Tables)
 6 Months Ended
Jun. 30, 2023
Other Current Assets [Abstract]  
Schedule of Other Current Assets Other current assets consisted of the following:
   December 31   June 30 
   2022   2023 
   RMB   RMB   US$ 
Tax recoverable   7,976    9,837    1,356 
Loans to third parties   24,581    28,860    3,980 
Deposits   1,218    1,138    157 
Staff advances   336    434    60 
Compensation receivable   842    100    14 
Others   399    435    60 
Less: expected credit losses   (1,435)   (3,060)   (422)
    33,917    37,744    5,205 
Schedule of Allowance for Doubtful Accounts An analysis of the expected credit losses was as follows:
   December 31   June 30 
   2022   2023 
   RMB   RMB   US$ 
Balance at beginning of the year   
-
    (1,435)   (198)
Additional allowance for credit losses charged to expense   (1,435)   (1,625)   (224)
Balance at the end of the year   (1,435)   (3,060)   (422)