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Cash, Cash Equivalents and Short-Term Investments (Tables)
9 Months Ended
Sep. 30, 2019
Cash and Cash Equivalents [Abstract]  
Schedule of cash, cash equivalents and short-term investments
   As of
September 30, 2019
   As of
December 31, 2018
 
Cash and cash equivalents  $2,354,561   $2,521,050 
Short-term investments   7,199,947     
Total  $9,554,508   $2,521,050