Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Detail)

v2.4.0.6
Stockholders' Equity (Detail) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Jan. 17, 2013
Apr. 30, 2013
Apr. 30, 2012
Mar. 28, 2013
Jul. 31, 2012
Common Stock, Par or Stated Value Per Share (in Dollars per share) $ 0.01     $ 0.01   $ 0.01 $ 0.01
Maximum Offering Price Under Sales Agreement           20,000,000  
Percentage of Commission Payable on Equity Offering       3.00%      
Average Sale Price of Stock (in Dollars per share)       $ 2.18      
Portion of Stock Proceed in Prepaid Expenses and Other (in Dollars) $ 200,000     $ 200,000      
Excess Tax Benefit from Share-based Compensation, Financing Activities (in Dollars) 0 0   0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     336,817        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     2.88 336,817      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     3 years 109 days        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     60.80%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     0.45%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments (in Dollars)     0        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares       0      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options (in Dollars) 400,000     400,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 328 days      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) $ 300,000     $ 300,000      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Outstanding Weighted Average Remaining Contractual Terms       1 year      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,322,000     2,322,000      
Vests Over Two Years [Member]
              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     247,672        
Vests Over Three Years [Member]
              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     89,145        
Common Stock [Member]
              
Stock Issued During Period, Shares, New Issues       72,487