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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2015
Fair Value of Warrants Outstanding | The fair value of the 2010 warrants at June 30, 2015 and December 31, 2014, consisted of the following (in thousands):
|  | June 30, 2015 |  |  | December 31, 2014 |
2010 Warrants |  | $ | 3,978 |  |  | $ | 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 June 30, 2015 and December 31, 2014:
|  | June 30, 2015 |  |  | December 31, 2014 |
2010 Warrants: |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 0.36 |  |  |  | 0.86 |
Estimated volatility |  |  | 52 | % |  |  | 55 | %
Risk-free interest rate |  |  | 0.01 | % |  |  | 0.25 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %

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