Geographic Information - Net Long-Lived Assets by Principal Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 5,924	$ 6,176
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	4,551	4,678
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	236	204
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	132	144
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	918	1,068
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 87	$ 82