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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Oct. 31, 2019
Oct. 30, 2019
Oct. 29, 2019
Ordinary Shares          
Par value     $ 0.01    
Ordinary shares authorized         100,000
Ordinary shares outstanding 7,004,900 7,004,900      
Class A ordinary shares          
Ordinary Shares          
Par value $ 0.01 $ 0.01 $ 0.01    
Ordinary shares authorized 70,000,000 70,000,000 70,000,000 700,000 71,369
Ordinary Shares issued 9,192,660 7,004,900      
Ordinary shares outstanding 9,192,660 7,004,900      
Class B ordinary shares          
Ordinary Shares          
Par value $ 0.01 $ 0.01 $ 0.01    
Ordinary shares authorized 30,000,000 30,000,000 30,000,000 300,000 28,631
Ordinary Shares issued 2,863,100 2,863,100      
Ordinary shares outstanding 2,863,100 2,863,100