Goodwill and Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 15,771	$ 12,522
Intangible assets, accumulated amortization	(4,720)	(3,367)
Intangible assets, net	11,051	9,155
Capitalized internal-use software costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	14,178	10,859
Intangible assets, accumulated amortization	(3,744)	(2,487)
Intangible assets, net	10,434	8,372
Software licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,023	1,093
Intangible assets, accumulated amortization	(406)	(314)
Intangible assets, net	617	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