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10. Stock Based Compensation (Details 1) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dividend-yield 0.00% 0.00%
Market price of the common stock   $ 6.10
Minimum [Member]
   
Risk-free interest rate 0.44% 0.23%
Expected volatility 70.16% 58.88%
Expected life (years) 4 months 24 days 6 months
Market price of the common stock $ 4.20  
Maximum [Member]
   
Risk-free interest rate 0.74% 0.57%
Expected volatility 79.93% 81.24%
Expected life (years) 3 years 4 years
Market price of the common stock $ 5.80