Deferred Revenue and Deferred Cost - Schedule of Deferred Revenue and Related Cost (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Deferred Revenue Arrangement [Line Items]
Deferred cost of revenue on product shipments	$ (1,335)	$ (861)
Deferred revenue	3,552	3,451
Product shipments [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	4,487	3,827
Licenses [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 400	$ 485