Geographic Information - Revenue by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 14,108	$ 12,612	$ 39,300	$ 35,739
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,099	3,300	8,588	8,369
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,492	2,786	6,320	7,572
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,615	1,924	7,273	5,827
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,475	1,706	6,915	5,290
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,211	1,042	3,498	2,981
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,233	936	3,497	2,793
Sweden [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	489	532	1,716	1,592
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 494	$ 386	$ 1,493	$ 1,315