Annual report pursuant to Section 13 and 15(d)

Acquisition Obligation (Details)

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Acquisition Obligation (Details)
12 Months Ended
Mar. 24, 2011
USD ($)
Jul. 31, 2015
USD ($)
item
shares
Jul. 31, 2014
USD ($)
Jul. 31, 2013
USD ($)
Mar. 24, 2012
shares
Sep. 28, 2011
shares
Acquisition obligation            
Class Of Warrant (in shares)   1,895,102        
Number of amendments | item   2        
Incremental borrowing rate used to discount acquisition obligation (as a percent)   5.00%        
Imputed interest discount | $ $ 174,000 $ 174,000        
Non-cash interest expense due to amendments | $   $ 0 $ 21,000 $ 83,000    
First Amendment            
Acquisition obligation            
Class Of Warrant (in shares)           50,000
Second Amendment            
Acquisition obligation            
Class Of Warrant (in shares)         150,000