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Fair Value Measurements - Summary of Changes in Fair Value of Level III Financial Liability Related to Common Stock Warrants (Detail) - Customer Common Stock Warrants [Member]
$ in Thousands
12 Months Ended
Jul. 31, 2015
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Fair value, beginning of period $ 1,254
Issuance of common stock warrants 0
Change in fair value of Level III liabilities 1,584
Exercise of common stock warrants (2,838)
Fair value, end of period $ 0