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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

X

- Definition

Class Of Warrant or Rights Exercisable Term

+ References

No definition available.

+ Details

Name:	imab_ClassOfWarrantOrRightsExercisableTerm
Namespace Prefix:	imab_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- 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
Balance Type:	na
Period Type:	duration

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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
Balance Type:	na
Period Type:	instant

X

- 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

Name:	us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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