Goodwill and Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 13,868	$ 12,522
Intangible assets, accumulated amortization	(4,033)	(3,367)
Intangible assets, net	9,835	9,155
Capitalized internal-use software costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	12,275	10,859
Intangible assets, accumulated amortization	(3,116)	(2,487)
Intangible assets, net	9,159	8,372
Software licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,023	1,093
Intangible assets, accumulated amortization	(347)	(314)
Intangible assets, net	676	779
Purchased developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	570	570
Intangible assets, accumulated amortization	(570)	(566)
Intangible assets, net	$ 0	$ 4