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Warrant Liability (Tables) | 12 Months Ended
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Dec. 31, 2013
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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, 2013 are as follows:
Risk-free interest rate per year |  |  | 0.8 | %
Expected volatility per year |  |  | 85.2 | %
Expected dividend yield |  |  | 0 | %
Expected life (years) |  |  | 3.0 |
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 2013:
|  | Series A |
|  | Number of Warrants |  |  | Fair value $ |
Balance at December 31, 2012 |  |  | 8,501,429 |  |  | $ | 9,157,397 |
Less exercised |  |  | (384,534 | ) |  |  | (470,303 | )
Changes in fair value |  |  | — |  |  |  | (3,145,285 | )
Balance at December 31, 2013 |  |  | 8,116,895 |  |  | $ | 5,541,809 |
Summary of Warrant Liability | The following table is a summary of our warrant liability as of December 31, 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 |  |  |  | — |
Series A Warrants |  |  | 8,116,895 |  |  |  | 1.40 |  |  |  | 5,541,809 |
Total |  |  | 9,551,378 |  |  |  |  |  |  | $ | 5,541,809 |

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