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LEASES - Supplemental cash flow information related to operating leases (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
LEASES
Cash paid for amounts included in the measurement of operating lease liabilities	¥ 4,884	$ 698	¥ 4,817	¥ 6,196

X

- Definition

Amount of cash paid for amounts included in measurement of operating lease liabilities.

+ References

No definition available.

+ Details

Name:	ncty_CashPaidForAmountsIncludedInMeasurementOfOperatingLeaseLiabilities
Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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