Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Current income tax provision:
Federal		$ 0	$ 0	$ 0
State		0	4	0
Foreign		278	423	476
Total current tax provision		278	427	476
Deferred income tax provision
Federal		0	0	0
State		0	0	(96)
Foreign		(63)	0	12
Total deferred tax provision	$ 0	(63)	0	(84)
Total income tax provision		$ 215	$ 427	$ 392