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11. Stock-Based Compensation (Details 2) (Options, USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Dividend-yield | 0.00% | 0.00%
Expected volatility |  | 79.08%
Weighted average fair value per share of common stock | $ 0.28 | $ 0.26
Minimum |  |
Risk-free interest rate | 0.13% | 0.28%
Expected volatility | 60.37% |
Expected life (years) | 1 year | 2 years
Maximum |  |
Risk-free interest rate | 0.67% | 0.38%
Expected volatility | 79.70% |
Expected life (years) | 3 years | 3 years

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