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10. Stock Based Compensation (Details 1) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Stock Based Compensation Details 1    
Dividend-yield 0.00% 0.00%
Risk-free interest rate 0.18-0.42 1.22-3.66
Expected volatility 74.83-142.90 58.88-120.90
Expected life (years), min 5 years 2 months 12 days
Expected life (years), max 3 months 18 days 4 years
Weighted average fair value per share of common stock, min $ 0.08 $ 0.56
Weighted average fair value per share of common stock, max $ 0.32