Deferred Revenue and Deferred Cost - Schedule of Deferred Revenue and Related Cost (Detail) - USD ($) $ in Thousands	Oct. 31, 2015	Jan. 31, 2015
Deferred Revenue Disclosure [Abstract]
Deferred revenue on product shipments	$ 5,932	$ 4,663
Deferred revenue from licenses & services	2,865	1,610
Deferred cost of revenue on product shipments	(1,853)	(1,168)
Total deferred revenue, net	$ 6,944	$ 5,105