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Accruals And Other Payables - Additional Information (Details) ¥ in Thousands, $ in Thousands			9 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2020 CNY (¥)	Sep. 30, 2020 CNY (¥)
Payables and Accruals [Abstract]
Proceeds from non-refundable incentive	$ 1,857	¥ 12,982
Other income			¥ 1,731

X

- Definition

Proceeds from non-refundable incentive.

+ References

No definition available.

+ Details

Name:	imab_ProceedsFromNonRefundableIncentive
Namespace Prefix:	imab_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of revenue and income classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.4)
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

+ Details

Name:	us-gaap_OtherIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration