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Transition report pursuant to Rule 13a-10 or 15d-10

12. Stockholders' Equity (Deficiency) (Details 2)

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12. Stockholders' Equity (Deficiency) (Details 2)
4 Months Ended 12 Months Ended
Apr. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Expected forfeiture rate 3.90% 1.70% 0.00%
Stock Incentive Plan To Employees And Directors [Member]
     
Expected life (years) minimum 3 years 6 months 2 years 6 months   
Expected life (years) maximum 3 years 9 months 3 years 9 months 18 days   
Expected volatility minimum 46.30% 44.20%   
Expected volatility maximum 46.50% 50.90%   
Weighted-average volatility 46.50% 49.00%   
Risk-free interest rate, Minimum 0.36% 0.31%   
Risk-free interest rate, Maximum 0.44% 0.60%   
Dividend yield 0.00% 0.00%   
Expected forfeiture rate 3.90% 1.70%