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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value of Warrants | The fair value of the warrants at December 31, 2013 and 2012 consisted of the following (in thousands):
|  | December 31, |
|  | 2013 |  |  | 2012 |
2009 Warrants |  | $ | 8,542 |  |  | $ | 2,009 |
2010 Warrants |  |  | 11,848 |  |  |  | 3,894 |
Total warrant liability |  | $ | 20,390 |  |  | $ | 5,903 |
Fair Value Assumptions of Warrants | The fair value of the Company’s warrants was based on using the Black-Scholes model and/or binomial-lattice option valuation model and using the following assumptions at December 31, 2013 and 2012:
|  | December 31,
|  | 2013 |  | 2012
2009 Warrants: |  |  |  |
Expected term (in years) |  | 0.65 |  | 1.65
Estimated volatility |  | 45% |  | 45%
Risk-free interest rate |  | 0.10% |  | 0.25%
Expected dividend yield |  | 0% |  | 0%
2010 Warrants: |  |  |  |
Expected term (in years) |  | 1.86 |  | 2.86
Estimated volatility |  | 41% |  | 51%
Risk-free interest rate |  | 0.38% |  | 0.36%
Expected dividend yield |  | 0% |  | 0%

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