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Warrant Liability (Tables) | 3 Months Ended
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Mar. 31, 2016
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Assumptions Used for Simulation Model | The assumptions used for the Monte Carlo simulation model to value the outstanding Series A Warrants at March 31, 2016 are as follows:
|  | Series A (2011) |  |  | Series A (2016) |  |  | Series B (2016) |
Risk-free interest rate per year |  |  | 0.48 | % |  |  | 0.72 | % |  |  | 1.4 | %
Expected volatility per year |  |  | 85.7 | % |  |  | 76.9 | % |  |  | 77.5 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected life (years) |  |  | 0.7 |  |  |  | 2 |  |  |  | 6 |
Summary of Changes in Fair Value of Warrant Liability | The following table is a summary of the changes in fair value of warrant liability in 2016:
|  | Series A (2011) |  |  | Series A (2016) |  |  | Series B (2016) |  |  | Total |
Balance at December 31, 2015 |  | $ | 770,964 |  |  | $ | — |  |  | $ | — |  |  | $ | 770,964 |
New Issues |  |  |  |  |  | $ | 1,770,596 |  |  | $ | 3,896,339 |  |  |  | 5,666,935 |
Changes in fair value |  |  | (259,370 | ) |  |  | (9,659 | ) |  |  | (9,199 | ) |  |  | (278,228 | )
Balance at March 31, 2016 |  | $ | 511,594 |  |  | $ | 1,760,937 |  |  | $ | 3,887,140 |  |  | $ | 6,159,671 |
Summary of Warrant Liability | The following table is a summary of our warrant liability as of March 31, 2016:
Warrants |  | Number Outstanding |  |  | Exercise Price ($) per share |  |  | Fair Value |
Series A (2011) |  |  | 578,074 |  |  |  | 3.60 |  |  | $ | 511,594 |
Series A (2016) |  |  | 1,277,598 |  |  |  | 3.60 |  |  |  | 1,760,937 |
Series B (2016) |  |  | 1,916,396 |  |  |  | 5.04 |  |  |  | 3,887,140 |
|  |  | 3,772,068 |  |  |  |  |  |  | $ | 6,159,671 |

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