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Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 2,354,561 $ 2,521,050 $ 2,393,263 $ 3,798,811
Short-term investments 7,199,947    
Total $ 9,554,508 $ 2,521,050