Geographic Information - Net Long-Lived Assets by Principal Geographic Area (Detail) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 13,654	$ 14,028
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	13,094	13,412
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	186	222
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	140	145
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	120	128
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 114	$ 121