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Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Cash and Cash Equivalents [Abstract]      
Cash and cash equivalents $ 6,202,663 $ 6,293,293 $ 1,296,016
Short-term investments 1,992,098 2,480,753 $ 8,675,329
Total $ 8,194,761 $ 8,774,046