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Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value) (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Liabilities    
Non-current portion of derivative instruments related to stock purchase warrants $ 481,747 $ 629,170
Total derivative instruments related to stock purchase warrants 590,049  
Recurring [Member]    
Assets    
Investment in money market funds [1] 6,429,777 6,429,104
Total investment in money market funds 6,429,777 6,429,104
Liabilities    
Current portion of derivative instruments related to stock purchase warrants 108,302 178,509
Non-current portion of derivative instruments related to stock purchase warrants 481,747 629,170
Total derivative instruments related to stock purchase warrants 590,049 807,679
Recurring [Member] | Level 1 [Member]    
Assets    
Investment in money market funds [1] 6,429,777 6,429,104
Total investment in money market funds $ 6,429,777 $ 6,429,104
Liabilities    
Current portion of derivative instruments related to stock purchase warrants    
Non-current portion of derivative instruments related to stock purchase warrants    
Total derivative instruments related to stock purchase warrants    
Recurring [Member] | Level 2 [Member]    
Assets    
Investment in money market funds [1]    
Total investment in money market funds    
Liabilities    
Current portion of derivative instruments related to stock purchase warrants    
Non-current portion of derivative instruments related to stock purchase warrants    
Total derivative instruments related to stock purchase warrants    
Recurring [Member] | Level 3 [Member]    
Assets    
Investment in money market funds [1]    
Total investment in money market funds    
Liabilities    
Current portion of derivative instruments related to stock purchase warrants $ 108,302 $ 178,509
Non-current portion of derivative instruments related to stock purchase warrants 481,747 629,170
Total derivative instruments related to stock purchase warrants $ 590,049 $ 807,679
[1] Included in cash and cash equivalents on the accompanying condensed consolidated balance sheets.