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13. Derivative Liabilities (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Fair value assumptions schedule |
Estimated fair value of underlying common stock |  | $ | 3.00 |
Remaining life in years |  |  | 3.15 |
Risk-free interest rate |  |  | 0.38 | %
Expected volatility |  |  | 142 | %
Dividend yield |  |  | – |
Estimated fair value of underlying common stock |  |  | $3.00 |
Remaining life in years |  |  | 3.05 - 3.15 |
Risk-free interest rate |  |  | 0.35% - 0.38% |
Expected volatility |  |  | 141% - 142% |
Dividend yield |  |  | – |

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