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Share Based Payments - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Apr. 02, 2012
2012 Retention Plan
Aug. 31, 2013
2012 Retention Plan
Aug. 31, 2012
2012 Retention Plan
Aug. 31, 2013
Minimum
Aug. 31, 2013
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted, term     10 years            
Stock options vesting period     3 years            
Annual percentage over three years     33.33%            
Stock options weighted average grant date fair value     $ 1.36 $ 0.71          
Shares available for future grants 3,800,000   3,800,000            
Vesting dates of outstanding options               2013-07 2017-03
Expiration dates of options               2014-03 2023-03
Restricted stock awards requisite service period     3 years            
Grant date fair value of shares vested     $ 400,000 $ 100,000          
Preferred stock contributed by company         400,000        
Compensation expenses 2,419,000 565,000 3,082,000 954,000   1,500,000 500,000    
Unrecognized compensation cost $ 3,000,000   $ 3,000,000            
Compensation cost of weighted average period     1 year 2 months 12 days