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Stockholders' Equity (Deficiency) (Schedule of Assumptions Used to Value Stock Options) (Details) (Stock Incentive Plan and Stock Option Grants to Employees and Directors [Member])
4 Months Ended 12 Months Ended
Apr. 30, 2013
Apr. 30, 2014
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (years)   3 years 3 months 18 days  
Expected volatility   45.00%  
Expected volatility, minimum 46.30%   44.20%
Expected volatility, maximum 46.50%   50.90%
Weighted-average volatility 46.50% 45.00% 49.00%
Risk-free interest rate   0.38%  
Risk-free interest rate, minimum 0.36%   0.31%
Risk-free interest rate, maximum 0.44%   0.60%
Dividend yield 0.00% 0.00% 0.00%
Expected forfeiture rate 3.90%    1.70%
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (years) 3 years 6 months   2 years 6 months
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (years) 3 years 9 months   3 years 9 months 18 days