Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Deferred income tax assets:
Accrued expenses	$ 177	$ 118
Net operating loss	50,620	49,864
Total deferred income tax assets	50,797	49,982
Valuation allowance	(50,797)	(49,982)	(52,107)
DEFERRED INCOME TAX ASSETS, NET

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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