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Balance Sheet Components - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Jul. 31, 2016
Jul. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 5,010 $ 5,939
Less: accumulated depreciation and amortization (3,087) (2,795)
Property and equipment, net 1,923 3,144
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,553 2,668
Computer equipment and software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,777 2,600
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 680 $ 671