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Merck GHI Financing (Details Textual) - USD ($)
12 Months Ended
Jul. 14, 2015
Dec. 31, 2015
Dec. 31, 2014
Jul. 31, 2015
Common Stock and Note Purchase Agreement [Line Items]        
Proceeds from Issuance of Common Stock   $ 17,366,620 $ 0  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs   $ 58,566    
Merck GHI Financing Agreement [Member]        
Common Stock and Note Purchase Agreement [Line Items]        
Stock Issued During Period, Shares, New Issues 1,136,364      
Shares Issued, Price Per Share $ 4.40      
Proceeds from Issuance of Common Stock $ 5,000,000      
Debt Instrument, Interest Rate, Stated Percentage 8.00%     8.00%
Debt Instrument, Face Amount $ 1,000,000      
Fees Related to Common Stock and Debt Transaction 50,000      
Payments of Debt Issuance Costs 8,000      
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs $ 42,000