Equity Investment, Percentage Ownership Interest To Be Reacquired

No definition available.

Name:	ncty_EquityInvestmentPercentageOwnershipInterestToBeReacquired
Namespace Prefix:	ncty_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity method investment, ownership in joint venture, percentage.

+ References

No definition available.

+ Details

Name:	ncty_EquityMethodInvestmentOwnershipInJointVenturePercentage
Namespace Prefix:	ncty_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

License Agreement Term

+ References

No definition available.

+ Details

Name:	ncty_LicenseAgreementTerm
Namespace Prefix:	ncty_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount by which the fair value of an equity method investment and other investment are less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

No definition available.

+ Details

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

- Definition

Ownership Percentage Under Cost Method Investments

+ References

No definition available.

+ Details

Name:	ncty_OwnershipPercentageUnderCostMethodInvestments
Namespace Prefix:	ncty_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Payments To Be Made To Reacquire Equity Investments

+ References

No definition available.

+ Details

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

- Definition

Potential License Payment

+ References

No definition available.

+ Details

Name:	ncty_PotentialLicensePayment
Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Related party transactions advances refunded.

+ References

No definition available.

+ Details

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

- Definition

Reversal of related party liability.

+ References

No definition available.

+ Details

Name:	ncty_ReversalOfRelatedPartyLiability
Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sale Of Equity Method Investment Ownership Percentage

+ References

No definition available.

+ Details

Name:	ncty_SaleOfEquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	ncty_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Shares lock-up agreement period.

+ References

No definition available.

+ Details

Name:	ncty_SharesLockupAgreementPeriod
Namespace Prefix:	ncty_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

+ References

+ Details

Name:	us-gaap_CommonStockSharesSubscribedButUnissued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714

+ Details

Name:	us-gaap_EquitySecuritiesFvNiRealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

+ Details

Name:	us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562

+ Details

Name:	us-gaap_ImpairmentOfInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(10))
-URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(f))
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

+ Details

Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Balance held at close of period in number of shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14.Column B)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.Column B)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.Column B)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

+ Details

Name:	us-gaap_InvestmentOwnedBalanceShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of nonredeemable preferred stock (shares) (or preferred stock redeemable solely at the option of the issuer) allocated to investors to buy shares of a new issue of preferred stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

+ References

+ Details

Name:	us-gaap_PreferredStockShareSubscriptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	srt_OwnershipAxis=ncty_BeijingTiKnightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ncty_OrientalShinyStarLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ncty_RedAceLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=ncty_ConditionOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=ncty_ShanghaiJiuchengAdvertisementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ncty_LicenseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_SystemLinkCorporationLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ncty_SmilegateEntertainmentIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_ShanghaiBigDataCulturesMediaCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ncty_ShanghaiJiuchengAdvertisementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_T3EntertainmentCompanyLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_SmartpostingCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=ncty_IELimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_BeijingTiKnightNetworkTechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_MaxlineHoldingsLimitedMaxlineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=ncty_RedAceLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_LeadingChoiceHoldingsLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_ShanghaiThe9EducationTechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_ShanghaiRongleiCultureCommunicationCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_PlutuxLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=ncty_PlutuxLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=ncty_ZhenjiangKexinPowerSystemDesignAndResearchCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

INVESTMENTS - Additional Information (Details) ₩ in Millions	1 Months Ended										12 Months Ended
	Jul. 31, 2019 KRW (₩)	Jul. 31, 2019 USD ($)	Jul. 31, 2019 CNY (¥)	Jun. 30, 2019 shares	Nov. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) shares	Dec. 31, 2016	Nov. 30, 2015 USD ($)	Jun. 30, 2015	Apr. 30, 2008 shares	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 USD ($)	Dec. 31, 2018 CNY (¥)	Sep. 30, 2018 shares	Apr. 30, 2018 USD ($)	Apr. 30, 2018 CNY (¥)	Jan. 31, 2018 shares	Dec. 31, 2017 CNY (¥)	Jun. 30, 2017 CNY (¥)	Oct. 31, 2016	Aug. 31, 2016	Oct. 31, 2015	Aug. 31, 2015	Dec. 31, 2014 USD ($)	Feb. 29, 2012 shares
Subsidiary, Sale of Stock [Line Items]
Impairment of investment											$ 544,549	¥ 3,791,039		¥ 7,776,157		¥ 9,109,312
Share of loss in equity method investments											(408,983)	(2,847,260)		(4,292,887)		(2,937,131)
Proceeds from disposal of equity method investees											99,777	694,628		0		115,349
Impairment charges relating to its investments in equity and other											1,200,000	8,500,000		9,200,000		9,100,000
Beijing Ti Knight
Subsidiary, Sale of Stock [Line Items]
Cost method investment													$ 700,000
Oriental Shiny Star Limited
Subsidiary, Sale of Stock [Line Items]
Impairment of investment															$ 8,700,000
Red Ace Limited [Member]
Subsidiary, Sale of Stock [Line Items]
Impairment of assets \| ¥												1,300,000
Condition One \| Shanghai Jiucheng Advertisement Co., Ltd. ("Shanghai Jiucheng Advertisement")
Subsidiary, Sale of Stock [Line Items]
Equity method investment, ownership to be acquired																	$ 2,600,000
License Agreement
Subsidiary, Sale of Stock [Line Items]
Amount received for license agreement																			$ 10,000,000
System Link Corporation Limited ('System Link")
Subsidiary, Sale of Stock [Line Items]
Shareholdings to be received by Smilegate in Oriental Shiny Star Limited																														30.00%
System Link Corporation Limited ('System Link") \| Oriental Shiny Star Limited
Subsidiary, Sale of Stock [Line Items]
Amount refunded					$ 50,000,000
Liability waived off															25,000,000
Impairment of investment \| ¥																60,500,000
System Link Corporation Limited ('System Link") \| Oriental Shiny Star Limited \| Smilegate Entertainment Inc
Subsidiary, Sale of Stock [Line Items]
Amount refunded					$ 25,000,000
System Link Corporation Limited ('System Link") \| License Agreement \| Oriental Shiny Star Limited
Subsidiary, Sale of Stock [Line Items]
License agreement, term								5 years
Amount received for license agreement								$ 50,000,000
Potential License Payment								$ 450,000,000
Shanghai Big Data Cultures Media Co
Subsidiary, Sale of Stock [Line Items]
Impairment of investment											500,000	3,400,000
Share of loss in equity method investments											$ 400,000	¥ 2,800,000
Shanghai Big Data Cultures Media Co \| Shanghai Jiucheng Advertisement Co., Ltd. ("Shanghai Jiucheng Advertisement")
Subsidiary, Sale of Stock [Line Items]
Sale of equity method investment ownership percentage									33.30%
Shanghai Big Data Cultures Media Co \| Shanghai Jiucheng Advertisement Co., Ltd. ("Shanghai Jiucheng Advertisement")
Subsidiary, Sale of Stock [Line Items]
Equity interest acquired in Fei Fan																													100.00%
Equity interest exchanged																													30.00%
Investment in joint venture, ownership percentage								42.00%																			44.50%	43.70%	46.70%
Shanghai Big Data Cultures Media Co \| Condition One \| Shanghai Jiucheng Advertisement Co., Ltd. ("Shanghai Jiucheng Advertisement")
Subsidiary, Sale of Stock [Line Items]
Investment in joint venture, ownership percentage											44.46%	44.46%
Equity method investment, ownership percentage to be acquired							19.11%
Equity method investment, ownership to be acquired \| ¥																		¥ 18,300,000
T3 Entertainment Company Ltd
Subsidiary, Sale of Stock [Line Items]
Subscription to preferred shares \| shares										3,031,232
Ordinary shares owned \| shares																																32,290
Total consideration	₩ 6,092.8	$ 5,200,000
Gain on disposal		$ 1,500,000	¥ 10,400,000
Smartposting Co, Ltd. \| IE Limited [Member]
Subsidiary, Sale of Stock [Line Items]
Impairment of investment											$ 400,000	¥ 2,800,000		1,100,000		5,100,000
Equity interest exchanged						14.55%																				14.55%
Shares issued and sold \| shares						12,500,000
Lock-up period of agreement						10 years
Beijing Ti Knight Network Technology Co., Ltd. ("Beijing Ti Knight")
Subsidiary, Sale of Stock [Line Items]
Impairment of investment \| ¥												0		900,000		¥ 4,000,000
Cost method investment						$ 1,300,000														¥ 4,900,000						¥ 9,000,000
Maxline Holdings Limited Maxline \| Red Ace Limited [Member]
Subsidiary, Sale of Stock [Line Items]
Equity interest exchanged																								29.00%
Maxline Holdings Limited Maxline \| Red Ace Limited [Member]
Subsidiary, Sale of Stock [Line Items]
Impairment of investment											200,000	1,300,000
Maxline Holdings Limited Maxline \| Red Ace Limited [Member] \| Smilegate Entertainment Inc
Subsidiary, Sale of Stock [Line Items]
Common Stock, Shares Subscribed but Unissued \| shares																								3,571,429
Leading Choice Holdings Limited
Subsidiary, Sale of Stock [Line Items]
Impairment of investment													200,000	1,400,000
Common Stock, Shares Subscribed but Unissued \| shares																					21,000,000
Equity interest acquired in Fei Fan																					20.00%
Shanghai The9 Education Technology Co., Ltd. ("The9 Education Technology")
Subsidiary, Sale of Stock [Line Items]
Impairment of investment													100,000	400,000
Cost method investment																						$ 100,000	¥ 400,000
Shanghai Ronglei Culture Communication Co., Ltd. ("Shanghai Ronglei")
Subsidiary, Sale of Stock [Line Items]
Impairment of investment													600,000	4,000,000
Cost method investment													600,000		$ 700,000					¥ 4,000,000					¥ 5,000,000
Proceeds from disposal of equity method investees											400,000	3,000,000
Plutux Limited ("Plutux")
Subsidiary, Sale of Stock [Line Items]
Impairment of investment													$ 200,000	¥ 1,400,000
Common Stock, Shares Subscribed but Unissued \| shares																					21,000,000
Plutux Limited ("Plutux") \| Plutux Limited ("Plutux")
Subsidiary, Sale of Stock [Line Items]
Equity interest exchanged																					8.00%
Zhenjiang Kexin Power System Design and Research Co., Ltd. ("Zhenjiang Kexin")
Subsidiary, Sale of Stock [Line Items]
Impairment of investment											$ 100,000	¥ 1,000,000
Common Stock, Shares Subscribed but Unissued \| shares				3,444,882
Percentage of equity interest				9.90%
Minimum
Subsidiary, Sale of Stock [Line Items]
Potential License Payment																															$ 160,000,000
Maximum \| T3 Entertainment Company Ltd
Subsidiary, Sale of Stock [Line Items]
Percentage of equity interest										20.00%