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Variable Interest Entities and Joint Ventures (Details) - USD ($)
$ in Thousands
Feb. 23, 2021
Aug. 05, 2020
Sep. 07, 2021
Dec. 31, 2020
Mar. 24, 2019
The9 Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage         50.00%
Conditional obligation       $ 1,128 $ 5,000
The9 Joint Venture | Class A Common Stock          
Schedule of Equity Method Investments [Line Items]          
Conversion of convertible securities (in shares) 423,053        
The Geely Intellectual Property License Agreement          
Schedule of Equity Method Investments [Line Items]          
One-time license amount paid     $ 50,000    
The9 Limited | The9 Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage         50.00%
LeSEE          
Schedule of Equity Method Investments [Line Items]          
Ownership interest   99.00%      
LeSEE | LeSEE Zhile Technology Co, Ltd          
Schedule of Equity Method Investments [Line Items]          
Ownership interest transferred   48.00%      
Consideration paid   $ 0      
LeSEE | LeSEE Zhile Technology Co, Ltd          
Schedule of Equity Method Investments [Line Items]          
Ownership interest   1.00%