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Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Schedule of Cash, cash equivalents short-term investments        
Cash and cash equivalents $ 4,252,020 $ 4,561,304 $ 5,150,344 $ 1,573,328
Short-term investments 2,978,355   5,474,013  
Total 7,230,375   $ 10,624,357  
(Decrease) in cash and cash equivalents (898,324) $ 2,987,976    
(Decrease) in short-term investments (2,495,658)      
(Decrease) in Total $ (3,393,982)