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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Assumptions of Warrants | The fair value of the 2010 Warrants was based on option valuation model and using the following assumptions at December 31, 2015 and 2014:
|  | December 31, 2015 |  | December 31, 2014
2010 Warrants: |  |  |  |
Expected term (in years) |  | — |  | 0.86
Estimated volatility |  | — |  | 55%
Risk-free interest rate |  | — |  | 0.25%
Expected dividend yield |  | — |  | —

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