Segment Information and Information About Geographic Areas - Summary of Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 92,027	$ 68,607	$ 52,702
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	58,931	42,295	35,434
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	8,077	8,319	4,049
Rest of the World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 25,019	$ 17,993	$ 13,219