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Principal Activities and Organization (Tables)
 9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Principal Subsidiaries
As of
September 30, 2020, the Company’s principal subsidiaries are as follows:
 
Subsidiaries
  
Place of
incorporation
  
Date of
incorporation or
acquisition
  
Percentage
of direct
or indirect
ownership
by the
Company
    
Principal activities
I-Mab
Biopharma Hong Kong Limited
(“I-Mab
Hong Kong”)
   Hong Kong   July 8, 2016     100 %    Investment holding
I-Mab
Shanghai
   PRC   August 24, 2016     100 %    Research and development
of innovative medicines
I-Mab
Bio-tech
(Tianjin) Co., Ltd.
(“I-Mab
Tianjin”)
   PRC   July 15, 2017     100 %    Research and development
of innovative medicines
I-Mab
Biopharma US Ltd.
   U.S.   February 28, 2018     100 %    Research and development
of innovative medicines