Deferred Revenue and Deferred Cost - Schedule of Deferred Revenue and Related Cost (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jan. 31, 2013
Deferred Revenue Disclosure [Abstract]
Deferred revenue on product shipments	$ 6,426	$ 3,827
Deferred revenue from licenses	100	485
Deferred cost of revenue on product shipments	(1,635)	(861)
Total deferred income	$ 4,891	$ 3,451