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Lease (Tables)
6 Months Ended
Jun. 30, 2024
Lease [Abstract]  
Schedule of Balance Sheet Information Related to Operating Leases Supplemental balance sheet information related to operating leases was as follows:
   As of
December 31,
   As of
June 30,
 
   2023   2024   2024 
   RMB   RMB   US$ 
Right-of-use assets, net   12,157    8,544    1,176 
                
Operating lease liabilities - current   7,974    6,101    840 
Operating lease liabilities - non-current   4,798    2,773    382 
Total operating lease liabilities   12,772    8,874    1,222 
Schedule of Weighted Average Remaining Lease Terms and Discount Rates of Operating Leases The weighted average remaining lease terms and discount rates for all of operating leases were as follows as of June 30, 2024:
Remaining lease term and discount rate:     
Weighted average remaining lease term (years)  1.5 years  
Weighted average discount rate  4.75%  
Schedule of Maturities Lease Liabilities Maturities of lease liabilities were as follows:
Twelve months ending June 30,  RMB   US$ 
2025   6,327    871 
2026   2,811    387 
Total future minimum lease payments   9,138    1,258 
Less: imputed interest   (264)   (36)
Present value of lease liabilities   8,874    1,222