Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 3)

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Income Taxes (Details 3) - USD ($)
12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Significant components of the deferred tax assets      
Net operating loss carryforwards $ 15,460,000 $ 8,211,000  
Credits 1,082,000 397,000  
Start-up costs 56,000 61,000  
Accumulated Depreciation 591,000 663,000  
Other 1,691,000 877,000  
Net deferred tax assets 18,880,000 10,209,000  
Valuation allowance for deferred tax assets $ (18,880,000) $ (10,209,000)  
Reconciliation of incomes taxes using statutory income tax rate, compared to effective rate      
Federal tax benefit at the expected statutory rate (as a percent) 34.00% 34.00% 34.00%
State income tax, net of federal tax benefit (as a percent) (0.01%) (0.01%) (0.01%)
Non-deductible expenses (as a percent) (1.34%) (0.45%) (0.08%)
Change in valuation allowance (as a percent) (34.55%) (33.90%) (33.93%)
Other (as a percent) 1.89%    
Income tax benefit - effective rate (as a percent) (0.01%) (0.36%) (0.02%)