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ASSETS HELD-FOR-SALE AND LIABILITIES HELD-FOR-SALE - Additional Information (Details)
¥ in Millions, $ in Millions
1 Months Ended
Feb. 21, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Sep. 26, 2019
USD ($)
subsidiary
Feb. 29, 2020
CNY (¥)
subsidiary
Sep. 30, 2019
subsidiary
Sep. 26, 2019
CNY (¥)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of subsidiaries disposed of           3  
Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of subsidiaries disposed of         3    
12% Convertible Senior Notes Due 2018 | Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Repayment of convertible notes | $ $ 4.8 $ 4.8          
Amount of remaining outstanding balance of convertible notes | $ $ 55.5            
The9 Computer, C9I Shanghai and Shanghai Kaie              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of subsidiaries disposed of       3      
Total consideration       $ 70.8     ¥ 493.0
Percentage of consideration received 90.00%            
Remaining percentage of consideration expected to be received in May 2020 10.00%            
The9 Computer, C9I Shanghai and Shanghai Kaie | Held for sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Total consideration       $ 70.8     ¥ 493.0
Advance consideration | ¥     ¥ 49.3        
Percentage of consideration received in advance     10.00%        
The9 Computer, C9I Shanghai and Shanghai Kaie | Held for sale | Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Total consideration | ¥         ¥ 443.7