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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2014
Stockholders' Deficit [Abstract]  
Gross proceeds received in connection with offerings

The table below reflects the gross proceeds received in connection with the 2012 offerings allocated to components of stockholders’ equity and to derivative liabilities based upon fair value:

 

Par value of Series A preferred stock issued $4,898 
Additional paid-in-capital  2,151,040 
Derivative warrant liabilities  111,777 
Derivative preferred stock conversion feature  872,688 
Derivative  Warrants issued to placement agent as offering costs  79,615 
Net proceeds  3,220,018 
Offering costs paid in cash  699,482 
Gross proceeds $3,919,500 

 

The table below reflects the gross proceeds received in connection with the 2013 offerings allocated to components of stockholders’ equity and to derivative liabilities based upon fair value:

 

Par value of Series A preferred stock issued $

5,100

 
Additional paid-in-capital  

1,479,610

 
Derivative warrant liabilities  113,153 
Derivative preferred stock conversion feature  1,647,910 
Derivative Warrants issued to placement agent as offering costs  248,655 
Net proceeds  3,494,428 
Offering costs paid in cash  586,072 
Gross proceeds $4,080,500 

The table below reflects the gross proceeds received in connection with the May and June 2014 offerings allocated to components of stockholders’ equity and to derivative liabilities based upon fair value:

 

Par value of common stock issued $17,164 
Additional paid-in-capital  17,878,994 
Derivative warrant liabilities  3,337,025 
Derivative warrants issued to placement agent as offering costs  996,138 
Net proceeds  22,222,321 
Offering costs paid in cash  3,516,378 
Gross proceeds $25,745,699 
Summary of changes in options outstanding

  Number of
Shares		  Weighted
Average
Exercise
Price
Per Share		  Weighted
Average
Remaining
Contractual
Term (Years)		  Aggregate
Intrinsic
Value		 
Outstanding at December 31, 2011               
Granted  677,962  $0.80         
Outstanding and expected to vest at December 31, 2012  677,962  $0.80   9.5  $- 
Granted  1,187,449  $0.80         
Outstanding and expected to vest at December 31, 2013  1,865,411  $0.80   8.8  $1,305,000 
   Granted  1,499,760  $1.50   9.7  $3,000,000 
Outstanding and expected to vest at June 30, 2014   3,365,171  $1.11   8.9  $5,238,000 
Options exercisable at June 30, 2014  652,005  $0.80   9.0  $782,400 
Weighted average fair value of options granted
  Six Month
Ended 		  For the Years Ended
December 31,		 
  June 30, 2014  2013  2012 
          
Current price of common stock $2.00  $0.80  $0.30 
Risk free interest rate  1.5% to 1.6%  1.4%  0.6%
Dividend yield  0%  0%  0%
Volatility   76% to 77%  73% to 80%  82%
Expected term (in years)  6.25   5.75 to 10   5.75 
 
Summary of changes in warrants outstanding
  Number of
Shares		  Weighted
Average
Exercise
Price
Per Share		 
Outstanding at December 31, 2011  6,251  $1.00 
Granted  5,478,360  $0.50 
Exercised  (619,377) $0.80 
Outstanding at December 31, 2012  4,865,234     
Granted  4,061,283  $0.54 
Outstanding at December 31, 2013  8,926,517  $0.54 
Granted  35,086,253  $1.58 
Forfeited (1)  (868,213) $0.80 
Outstanding and vested at June 30, 2014  43,144,557  $1.25 
 
Weighted average fair value of warrants granted
 
  

Six Month 
Ended,

June 30,

  Years Ended December 31, 
  2014  2013  2012 
Current price of common stock $2.00   $0.80 - $1.50  $0.30 
Risk-free interest rate  0.7% to 2.0%  0.9% to 1.8%  0.6% to .7%
Dividend yield  0%  0%  0%
Expected volatility  75% to 76%  73% to 83%  82% to 83%
Expected term (in years)  4 and 7   4-7   5