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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2021
Commitments and Contingencies.  
Summary of future minimum lease payments under non-cancellable operating leases

    

RMB

    

US$

2022

 

34,949

 

5,484

2023

 

24,394

 

3,828

2024

4,600

722

2025 and thereafter

2,226

349

Total

 

66,169

 

10,383