Geographic Information - Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 16,556	$ 16,785
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	5,390	4,307
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,863	2,549
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,296	3,426
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	610	1,887
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,556	1,644
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,841	$ 2,972