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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2014
Fair Value of Warrants Outstanding | The fair value of the warrants outstanding at December 31, 2014 and 2013, consisted of the following (in thousands):
|  | December 31, |
|  | 2014 |  |  | 2013 |
2009 Warrants |  | $ | — |  |  | $ | 8,542 |
2010 Warrants |  |  | 10,485 |  |  |  | 11,848 |
Total warrant liability |  | $ | 10,485 |  |  | $ | 20,390 |
Fair Value Assumptions of Warrants | The fair value of the Company’s warrants was based on option valuation model and using the following assumptions at December 31, 2014 and 2013:
|  | December 31, 2014 |  | December 31, 2013
2009 Warrants: |  |  |  |
Expected term (in years) |  | — |  | 0.65
Estimated volatility |  | — |  | 45%
Risk-free interest rate |  | — |  | 0.10%
Expected dividend yield |  | — |  | 0%
|  | December 31, 2014 |  | December 31, 2013
2010 Warrants: |  |  |  |
Expected term (in years) |  | 0.86 |  | 1.86
Estimated volatility |  | 55% |  | 41%
Risk-free interest rate |  | 0.25% |  | 0.38%
Expected dividend yield |  | 0% |  | 0%

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