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Document and Entity Information - shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Document and Entity Information    
Document Type 20-F  
Document Registration Statement false  
Document Annual Report true  
Document Period End Date Dec. 31, 2022  
Document Transition Report false  
Document Shell Company Report false  
Entity File Number 001-34238  
Entity Registrant Name The9 LTD  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 17 Floor, No. 130 Wu Song Road  
Entity Address, Address Line Two Hong Kou District  
Entity Address, City or Town Shanghai  
Entity Address, Postal Zip Code 200080  
Entity Address, Country CN  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
ICFR Auditor Attestation Flag false  
Entity Emerging Growth Company false  
Document Accounting Standard U.S. GAAP  
Entity Shell Company false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus FY  
Entity Central Index Key 0001296774  
Amendment Flag false  
Auditor Name RBSM LLP GRANT THORNTON
Auditor Firm ID 587 1487
Auditor Location New York, New York Shanghai, China
Business Contact    
Document and Entity Information    
Entity Address, Address Line One 17 Floor, No. 130 Wu Song Road  
Entity Address, Address Line Two Hong Kou District  
Entity Address, City or Town Shanghai  
Entity Address, Postal Zip Code 200080  
Entity Address, Country CN  
Contact Personnel Name George Lai  
City Area Code +86-21  
Local Phone Number 6108-6080  
Contact Personnel Email Address georgelai@corp.the9.com  
ADR    
Document and Entity Information    
Title of 12(b) Security American Depositary Shares  
Trading Symbol NCTY  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding 160,315,107  
Common Class A [Member]    
Document and Entity Information    
Title of 12(b) Security Class A ordinary shares, par value US$0.01 per share  
No Trading Symbol Flag true  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding 847,437,583  
Class B ordinary shares    
Document and Entity Information    
Entity Common Stock, Shares Outstanding 13,607,334