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LEASES - Supplemental cash flow information related to operating leases (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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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

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- 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

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration