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Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Schedule of cash, cash equivalents short-term investments        
Cash and cash equivalents $ 2,305,264 $ 4,408,415 $ 5,150,344 $ 1,573,328
Short-term investments   5,474,013  
Total 2,305,264   $ 10,624,357  
(Decrease) in cash and cash equivalents (2,845,080) $ 2,835,087    
(Decrease) in short-term investments (5,474,013)      
(Decrease) in Total $ (8,319,093)