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Stockholders' Equity (Tables) | 6 Months Ended
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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 |

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