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Principal Activities and Organization (Tables) | 9 Months Ended
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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

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