Geographic and Segment Information - Net Long-Lived Assets by Principal Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 7,356	$ 6,176	$ 3,364
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	6,098	4,678	3,080
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	849	1,068	62
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	117	144	79
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	201	204	123
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 91	$ 82	$ 20