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Warrants - Details of accounting for warrants to purchase ordinary shares (Detail) - 9 months ended Sep. 30, 2020 - Warrants to purchase ordinary shares [Member] ¥ in Thousands | CNY (¥) shares | $ / shares
--- | --- | ---
Class of Warrant or Right [Line Items] |  |
Class Of Warrant or Rights Exercisable Term | 12 months |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 19.57
Class of Warrant or Right, Outstanding | shares | 3,744,032 |
Warrants and Rights Outstanding | ¥ | ¥ 71,874 |

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- Definition Class Of Warrant or Rights Exercisable Term + References No definition available. + Details
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Namespace Prefix: | imab_
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Balance Type: | na
Period Type: | duration

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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Period Type: | instant

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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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