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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2014
Fair Value of Warrants | The fair value of the warrants at September 30, 2014 and December 31, 2013, consisted of the following (in thousands):
|  | September 30, |  |  | December 31, |  |  |
|  | 2014 |  |  | 2013 |  |  |
2009 Warrants |  | $ | 0 |  |  | $ | 8,542 |  |  |
2010 Warrants |  |  | 3,931 |  |  |  | 11,848 |  |  |
Total warrant liability |  | $ | 3,931 |  |  | $ | 20,390 |  |  |
Fair Value Assumptions of Warrants | The fair value of the Company’s warrants was based on option valuation models and using the following assumptions at September 30, 2014 and December 31, 2013:
|  |  |  | December 31, |  |
|  |  |  | 2013 |  |
2009 Warrants: |  |  |  |  |  |
Expected term (in years) |  |  |  | 0.65 |  |
Estimated volatility |  |  |  | 45% |  |
Risk-free interest rate |  |  |  | 0.10% |  |
Expected dividend yield |  |  |  | 0% |  |
|  | September 30, |  | December 31, |  |
|  | 2014 |  | 2013 |  |
2010 Warrants: |  |  |  |  |  |
Expected term (in years) |  | 1.11 |  | 1.86 |  |
Estimated volatility |  | 47% |  | 41% |  |
Risk-free interest rate |  | 0.13% |  | 0.38% |  |
Expected dividend yield |  | 0% |  | 0% |  |

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