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Post-effective amendment to a registration statement that is not immediately effective upon filing

12. Stockholders' Equity (Deficiency) (Details 4)

v2.4.0.8
12. Stockholders' Equity (Deficiency) (Details 4) (Stock Incentive Plan To Non Employees [Member])
4 Months Ended 12 Months Ended
Apr. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Incentive Plan To Non Employees [Member]
     
Expected life (years) minimum 4 years 2 years 8 months 12 days   
Expected life (years) maximum 4 years 5 years   
Expected volatility minimum 46.50% 44.20%   
Expected volatility maximum 46.50% 50.00%   
Weighted-average volatility 46.50% 47.40%   
Risk-free interest rate, Minimum 0.38% 0.37%   
Risk-free interest rate, Maximum 0.38% 0.60%   
Dividend yield 0.00% 0.00%