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Stock Based Compensation - Additional Information (Detail) (USD $)
9 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Stock Based Compensation Activity [Line Items]    
Fair market value of the stock at the date of grant Not less than 85% of the fair market value of the stock at the date of grant  
Number of equity incentive plans granted 0  
Stock compensation $ 0 $ 3,000
Aggregate intrinsic value 0  
Minimum [Member]
   
Stock Based Compensation Activity [Line Items]    
Stock bonuses and restricted stock purchase agreements 85.00%  
Equity Incentive Plan 1997 [Member]
   
Stock Based Compensation Activity [Line Items]    
Number of equity incentive plans granted 0  
Equity Incentive Plan 1999 [Member]
   
Stock Based Compensation Activity [Line Items]    
Number of equity incentive plans granted 0  
Equity Incentive Plan 2001 [Member]
   
Stock Based Compensation Activity [Line Items]    
Number of equity incentive plans granted 0  
Number of shares issued under 1999 equity incentive plan 0  
Employee Stock Purchase Amended Plan [Member]
   
Stock Based Compensation Activity [Line Items]    
Equity incentive plans 200,000  
Stock Option [Member] | Minimum [Member]
   
Stock Based Compensation Activity [Line Items]    
Options vest period 4 years  
Stock Option [Member] | Maximum [Member]
   
Stock Based Compensation Activity [Line Items]    
Options vest period 10 years  
Employee Stock Purchase Plans [Member]
   
Stock Based Compensation Activity [Line Items]    
Stock compensation $ 0 $ 3,000