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v3.20.4

Related Party Balances and Transactions (Tables) | 9 Months Ended
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Sep. 30, 2020
Related Party Transactions [Abstract] |
Summary of Related Party Balances | Ordinary Shares to be issued to Everest*
|  | As of December 31, |  |  | As of September 30, |
|  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |  |  | US$ (Note 2.5) |
Everest (Note 16) |  |  | 258,119 |  |  |  | — |  |  |  | — |
Loans to an affiliate
|  | As of December 31, |  |  | As of September 30, |
|  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |  |  | US$ (Note 2.5) |
I-Mab Hangzhou (Note(i)) |  |  | — |  |  |  | 52,000 |  |  |  | 7,659 |
Summary of Related Party Transactions | Receipt of CRO services—recognized in research and development expenses
|  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |  |  | US$ (Note 2.5) |
Tasly Pharmaceutical Group Co., Ltd. |  |  | 5,590 |  |  |  | — |  |  |  | — |
Receipt of research and development funding
|  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |  |  | US$ (Note 2.5) |
Everest (Note 16) |  |  | 52,207 |  |  |  | — |  |  |  | — |
Project development fee – recognized in research and development expenses
|  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |  |  | US$ (Note 2.5) |
CMAB Biopharma (Suzhou) Inc. |  |  | — |  |  |  | 690 |  |  |  | 102 |

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- Definition Schedule of related party balances [Table Text Block]. + References No definition available. + Details
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Namespace Prefix: | imab_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration