Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 26,594	$ 21,044
Less accumulated depreciation	(12,566)	(9,012)
Property and equipment, net	14,028	12,032
Computer Software and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	23,321	17,964
Office Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,549	1,349
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,629	1,562
Construction in Process [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 95	$ 169