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Summary of Significant Accounting Policies (Details 1) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Transfer of warrant instruments to additional paid-in-capital $ (6,804,625) $ (15,295,841)  
Fair Value, Inputs, Level 3 [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Beginning balance 20,103,425 25,586,933 $ 5,090,988
Change in fair value of derivative liabilities included in net loss for the year ended June 30, 2015, the six months ended June 30, 2014 and for the year ended December 31, 2013, respectively 7,954,970 $ 3,710,277 12,877,675
Additions - warrant instruments 4,333,163   $ 373,699
Transfer of warrant instruments to additional paid-in-capital $ (6,804,625) $ (15,295,841)  
Additions - conversion feature of Series A preferred stock     $ 1,761,063
Ending balance $ 25,586,933 $ 14,001,369 $ 20,103,425