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Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Intangible assets
Intangible assets as of December 31, 2019 and
September 
30, 2020 are summarized as follows:
 
    
As of December 31,
    
As of September 30,
 
    
2019
    
2020
 
    
RMB
    
RMB
    
US$
(Note 2.5)
 
Cost
                          
IPR&D
     148,844        122,000        17,969  
Less: accumulated amortization
     —          —          —    
    
 
 
    
 
 
    
 
 
 
Net book value
     148,844        122,000        17,969