Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Equity Incentive Plans	0	12,773
Stock compensation	$ 4,000	$ 7,000
Number of equity incentive plans granted	0	0
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
Aggregate intrinsic value	0
Employee Stock Option [Member]
Unrecognized cost of nonvested option	0
Equity Incentive Plan 1997 [Member]
Number of equity incentive plans granted	0	0
Equity Incentive Plan 1999 [Member]
Equity Incentive Plans	400,000
Number of equity incentive plans granted	0	0
Equity Incentive Plan 2001 [Member]
Equity Incentive Plans	100,000
Number of shares issued under 1999 equity incentive plan	0	0
Employee Stock Purchase Plan [Member]
Equity Incentive Plans	50,000
Stock compensation	$ 4,000	$ 7,000
Employee Stock Purchase Amended Plan [Member]
Equity Incentive Plans	200,000
Minimum [Member]
Stock bonuses and restricted stock purchase agreements	85.00%
Minimum [Member] | Employee Stock Option [Member]
Options vest period	4 years
Maximum [Member] | Employee Stock Option [Member]
Options vest period	10 years