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Consolidated Statements of Comprehensive Loss
¥ in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2020
CNY (¥)
¥ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
CNY (¥)
¥ / shares
shares
Revenues      
Licensing and collaboration revenue     ¥ 30,000
Expenses      
Research and development expenses ¥ (698,461) $ (102,872) (578,377)
Administrative expenses (310,775) (45,772) (582,732)
Loss from operations (1,009,236) (148,644) (1,131,109)
Interest income 18,658 2,748 22,828
Interest expense (957) (141) (2,466)
Other income, net 420,900 61,992 1,758
Fair value change of warrants     5,609
Loss before income tax expense (570,635) (84,045) (1,103,380)
Income tax expense 0    
Net loss attributable to I-MAB (570,635) (84,045) (1,103,380)
Net loss attributable to ordinary shareholders (570,635) (84,045) (1,103,380)
Other comprehensive income (loss):      
Foreign currency translation adjustments, net of nil tax 15,530 2,288 66,254
Total comprehensive loss attributable to I-MAB (555,105) (81,757) (1,037,126)
Net loss attributable to ordinary shareholders ¥ (570,635) $ (84,045) ¥ (1,103,380)
Weighted-average number of ordinary shares used in calculating net loss per share—basic and diluted | shares 126,758,926 126,758,926 7,184,086
Net loss per share attributable to ordinary shareholders      
—Basic | (per share) ¥ (4.50) $ (0.66) ¥ (153.59)
—Diluted | (per share) ¥ (4.50) $ (0.66) ¥ (153.59)