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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value of Warrants | The fair value of the warrants at March 31, 2014 and December 31, 2013 consisted of the following (in thousands):
|  | March 31, 2014 |  |  | December 31, 2013 |
2009 Warrants |  | $ | 4,637 |  |  | $ | 8,542 |
2010 Warrants |  |  | 6,719 |  |  |  | 11,848 |
Total warrant liability |  | $ | 11,356 |  |  | $ | 20,390 |
Fair Value Assumptions of Warrants | The fair value of the Company’s warrants was based on using the binomial-lattice option valuation model and using the following assumptions at March 31, 2014 and December 31, 2013:
|  | March 31, 2014 |  |  | December 31, 2013 |
2009 Warrants: |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 0.40 |  |  |  | 0.65 |
Estimated volatility |  |  | 52 | % |  |  | 45 | %
Risk-free interest rate |  |  | 0.07 | % |  |  | 0.10 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
2010 Warrants: |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 1.61 |  |  |  | 1.86 |
Estimated volatility |  |  | 45 | % |  |  | 41 | %
Risk-free interest rate |  |  | 0.44 | % |  |  | 0.38 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %

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- Definition Schedule Of Fair Value Assumptions And Methodology For Warrants Table [Text Block] + References No definition available. + Details
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