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TAXATION - Additional Information - Cayman Islands (Details) ¥ in Thousands	Dec. 31, 2023 CNY (¥)
Cayman Islands
Income Tax and Tax Rate [Line Items]
Withholding tax	¥ 0

X

- Definition

Income tax and tax rate [Line Items]

+ References

No definition available.

+ Details

Name:	ih_IncomeTaxAndTaxRateLineItems
Namespace Prefix:	ih_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of withholding income taxes.

+ References

No definition available.

+ Details

Name:	ih_WithholdingIncomeTaxes
Namespace Prefix:	ih_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_CaymanIslandsTaxInformationAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: