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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment, net
   As of December 31, 
   2020   2021   2021 
   RMB   RMB   USD 
At cost:            
Computer and transmission equipment   6,640    7,472    1,172 
Furniture, fixtures and office equipment   427    584    92 
Total   7,067    8,056    1,264 
Less: accumulated depreciation   (5,711)   (6,382)   (1,001)
Property and equipment, net   1,356    1,674    263