Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 78,523	$ 52,629
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	75,425	50,501
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 3,098	$ 2,128