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Warrant Liability (Tables) | 9 Months Ended
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Sep. 30, 2013
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Assumptions Used for Simulation Model | The assumptions used for the Monte Carlo simulation model to value the Series A Warrants at September 30, 2013 are as follows:
Risk-free interest rate per year |  |  | 0.7 | %
Expected volatility per year |  |  | 83.6 | %
Expected dividend yield |  |  | 0 | %
Expected life in years |  |  | 3.2 |
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 for the nine-month period ended September 30, 2013:
|  | Series A |
|  | Number of Warrants |  |  | Fair value $ |
Balance at December 31, 2012 |  |  | 8,501,429 |  |  | $ | 9,157,397 |
Less exercised |  |  | (334,534 | ) |  |  | (418,841 | )
Changes in fair value |  |  | — |  |  |  | (332,862 | )
Balance at September 30, 2013 |  |  | 8,166,895 |  |  | $ | 8,405,694 |
Summary of Outstanding Warrants and Fair Value of Warrant Liability | The following table is a summary of our warrant liability as of September 30, 2013:
Warrants |  | Number Outstanding |  |  | Exercise Price ($) per share |  |  | Fair value |
Warrants issued in 2008 |  |  | 1,034,483 |  |  |  | 23.00 |  |  | $ | — |
Warrants issued in 2009 |  |  | 400,000 |  |  |  | 15.00 |  |  |  | 15,260 |
Series A Warrants |  |  | 8,166,895 |  |  |  | 1.40 |  |  |  | 8,405,694 |
Total |  |  | 9,601,378 |  |  |  |  |  |  | $ | 8,420,954 |

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