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Nature of Business (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Segment
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nature of Business (Textual)            
Number of operating segments | Segment     2      
Cash and cash equivalents $ 5,813,863 $ 3,183,289 $ 5,813,863 $ 3,183,289 $ 8,772,567 $ 4,921,545
Net decrease in cash and cash equivalents     $ (2,958,704) (1,738,256)    
Percentage decrease in cash and cash equivalents     34.00%      
Cash used in operations     $ (2,979,673) (2,352,314)    
Working capital 3,506,121   3,506,121   7,243,918  
Decrease in working capital     $ 3,737,797      
Percentage of decrease in working capital     52.00%      
Active grant funding available     $ 16,300,000      
Proceeds from the sale of NJ NOL         530,143  
Equity facility, available amount 10,300,000   $ 10,300,000      
Equity facility expiration date     Mar. 31, 2019      
Accumulated deficit (154,167,997)   $ (154,167,997)   $ (150,122,962)  
Net loss $ (2,311,598) $ (92,775) $ (4,045,035) $ (1,242,208)    
Reverse stock split, description    
The Company completed a reverse stock split of its issued and outstanding shares of common stock at a ratio of one-for-ten, whereby every ten shares of its common stock was exchanged for one share of its common stock.