Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Common Stock Reserved For Future Issuance (Details)

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Stock-Based Compensation - Summary of Common Stock Reserved For Future Issuance (Details) - shares
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Common Stock options outstanding (within the 2011 Plan and outside of the terms of the 2011 Plan) 8,912,720 3,639,613 3,263,460
Common Stock reserved for restricted stock unit release 647,500    
Common Stock authorized for future grant under the 2011 Plan 760,010    
Common Stock reserved for warrant exercise 8,958,059    
Commons Stock reserved for future ESPP issuance 410,903    
Total common stock reserved for future issuance 19,689,192