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Warrant Liability (Tables) | 12 Months Ended
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Dec. 31, 2015
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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 December 31, 2015 are as follows:
Risk-free interest rate per year |  |  | 0.6 | %
Expected volatility per year |  |  | 76.5 | %
Expected dividend yield |  |  | 0 | %
Expected life (years) |  |  | 1.0 |
Summary of Changes in Fair Value of Warrant Liability | The following table is a summary of the changes in fair value of warrant liability for the Series A Warrants in 2015:
|  | Series A |
|  | Number of Warrants |  |  | Fair value $ |
Balance at December 31, 2014 |  |  | 6,936,880 |  |  | $ | 1,684,551 |
Changes in fair value |  |  | — |  |  |  | (913,587 | )
Balance at December 31, 2015 |  |  | 6,936,880 |  |  | $ | 770,964 |

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