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11. Stock Based Compensation (Details 1) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Stock Based Compensation Details 1    
Risk-free interest rate 0.42 1.22-3.66
Expected volatility 75.55 58.88-120.90
Expected life (years), min 3 years 2 months 12 days
Expected life (years), max   4 years
Weighted average fair value per share of common stock $ 0.32 $ 0.56