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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Government subsidies (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Government subsidies received and recognized	¥ 12,413	$ 1,748	¥ 4,407

X

- Definition

The amount of government subsidies received and recognized.

+ References

No definition available.

+ Details

Name:	ih_AmountOfGovernmentSubsidies
Namespace Prefix:	ih_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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