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CONVERTIBLE NOTES - Summary of Changes In Convertible Notes, Net of Unamortized Discount (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025 CNY (¥)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2025 USD ($)
CONVERTIBLE NOTES
Balance at January 1,	¥ 43,061
Issuance of convertible notes, face value	86,247
Debt discount from issuance/sale of ADS shares	(43,796)
Conversion of convertible notes into ordinary shares	(52,418)
Amortization of debt discount	15,347
Exchange rate change on convertible notes' face value	(289)
Convertible notes	48,152	¥ 43,061	$ 6,886
Convertible notes, net at December 31,	¥ 48,152	¥ 43,061

X

- Definition

The amount of amortization of debt discount.

+ References

No definition available.

+ Details

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Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

n/a.

+ References

No definition available.

+ Details

Name:	ncty_ConvertibleNotesAbstract
Namespace Prefix:	ncty_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of debt discount form issuance of ADS shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for office expenses. Used to reflect the Amount of increase decrease in convertible notes face value, exchange rate change.

+ References

No definition available.

+ Details

Name:	ncty_IncreaseDecreaseFromExchangeRateChangeOnConvertibleNotesFaceValue
Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount issuance of convertible debt, face value.

+ References

No definition available.

+ Details

Name:	ncty_IssuanceOfConvertibleDebtFaceValue
Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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X

- Definition

Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-8

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