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Cover Page
9 Months Ended
Sep. 30, 2020
Document Information [Line Items]  
Document Type 6-K
Amendment Flag false
Document Period End Date Sep. 30, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus Q3
Entity Registrant Name I-MAB
Entity Central Index Key 0001778016
Current Fiscal Year End Date --12-31