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EMPLOYEE BENEFITS (Details) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
EMPLOYEE BENEFITS |  |  |  |
Employee benefits expenses related to full-time employees of subsidiaries and VIE subsidiaries incorporated in PRC | ¥ 3.6 | $ 0.5 | ¥ 4.4 | ¥ 5.5

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- Definition n/a. + References No definition available. + Details
Name: | ncty_EmployeeBenefitsAbstract
Namespace Prefix: | ncty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration