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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2015
Fair Value of Warrants Outstanding | The fair value of the warrants at March 31, 2015 and December 31, 2014, consisted of the following (in thousands):
|  | March 31, 2015 |  |  | December 31, 2014 |
2010 Warrants |  | $ | 4,189 |  |  | $ | 10,485 |
Fair Value Assumptions of Warrants | The fair value of the Company’s warrants was based on an option valuation model using the following assumptions at March 31, 2015 and December 31, 2014:
|  | March 31, 2015 |  |  | December 31, 2014 |
2010 Warrants: |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 0.61 |  |  |  | 0.86 |
Estimated volatility |  |  | 58 | % |  |  | 55 | %
Risk-free interest rate |  |  | 0.14 | % |  |  | 0.25 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %

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