Information about Geographic Areas - Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Long-lived assets by geography
Total long-lived assets	$ 49,907	$ 47,469	$ 28,203
North America [Member]
Long-lived assets by geography
Total long-lived assets	47,096	45,163	27,213
Europe and other [Member]
Long-lived assets by geography
Total long-lived assets	1,762	1,827	538
Asia Pacific [Member]
Long-lived assets by geography
Total long-lived assets	$ 1,049	$ 479	$ 452