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Long-term Debt (Tables)
 12 Months Ended
Jul. 31, 2016
Debt Disclosure [Abstract]  
Summary of Outstanding Loan Balances
The Company’s outstanding loan balances as of July 31, 2016 and July 31, 2015 are summarized as follows:

 
 
July 31,
Outstanding Loan Balances
 
2016
 
2015
 
 
(in thousands)
Silicon Valley Bank term loan
 
$
—

 
$
2,934

Silicon Valley Bank equipment loan
 
—

 
958

Silicon Valley Bank supplemental loan
 
2,207

 
—

Total principal amount
 
2,207

 
3,892

Less: Unamortized discount
 
(7
)
 
(26
)
Total debt
 
2,200

 
3,866

Less: current portion
 
(1,318
)
 
(2,079
)
Non-current debt, excluding current portion
 
$
882

 
$
1,787
Summary of Future Principal Maturities of Debt
The future principal maturities of debt as of July 31, 2016 are as follows:

 
(in thousands)
2017
$
1,324

2018
883

Total
$
2,207
Summary of Assumptions used to Estimate Fair Value of SVB Warrants
The following assumptions were used to estimate the fair value of the SVB warrants:

 
Year Ended July 31,
 
 
2015
 
2014
Expected volatility
 
42.0%
 
—%
Risk-free interest rate
 
2.3%
 
—%
Dividend yield
 
—%
 
—%
Expected term (in years)
 
10.0
 
—