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Commitments and contingencies (Tables)
6 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Payments Under Non-cancelable Operating Leases
As of June 30, 2021, future minimum payments under
non-cancellable
operating leases were as follows:
 
     RMB      US$  
For the six months ended December 31, 2021
     4,477        693  
For the years ended December 31,
                 
2022
     9,333        1,445  
2023
     6,577        1,019  
2024
     5,381        833  
    
 
 
    
 
 
 
Total
     25,768        3,990