Balance Sheet Components (Details 3) - USD ($) $ in Thousands	Oct. 31, 2015	Jul. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 3,639
Acquired Technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,200	$ 7,200
Accumulated amortization	(3,561)	(3,201)
Intangible assets, net	$ 3,639	$ 3,999