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LONG TERM INVESTMENTS - Available for sale investments - (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2017
CNY (¥)
Sep. 30, 2017
USD ($)
Jul. 31, 2017
CNY (¥)
Jul. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Securities, Available-for-sale              
Long term available for sale investments         $ 3,980,806 $ 932,251  
Unrealized gain on availableforsale investments           262,857  
Beijing Yingxin Network Technology Co., LTD ("Yingxin")              
Debt Securities, Available-for-sale              
Long term available for sale investments         753,496 762,955  
Percentage of equity interest acquired 2.91% 2.91%          
Purchase consideration ¥ 3,000,000 $ 461,092          
Unrealized gain on availableforsale investments         0 326,623 $ 0
Beijing Smart Zhenzhi Technology Co., LTD ("Zhenzhi")              
Debt Securities, Available-for-sale              
Long term available for sale investments         167,197 169,296  
Percentage of equity interest acquired     3.33% 3.33%      
Purchase consideration     ¥ 1,000,000 $ 153,697      
Unrealized gain on availableforsale investments         0 $ 23,853 $ 0
Alphalion Technology Holding Limited ("Alphalion")              
Debt Securities, Available-for-sale              
Long term available for sale investments         $ 3,060,113    
Percentage of equity interest acquired         25.00%