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13. Shareholder's Equity (Details 1) (USD $)
6 Months Ended
Jun. 30, 2013
MinimumMember
 
Stock Options  
Estimated fair value of underlying common stock $ 0.35
Risk-free interest rate 0.69%
Expected volatility 80.00%
MaximumMember
 
Stock Options  
Estimated fair value of underlying common stock $ 0.38
Risk-free interest rate 0.89%
Expected volatility 89.00%
Stock Options
 
Stock Options  
Remaining life 5 years
Dividend yield