Goodwill and Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross	$ 24,660	$ 18,061
Accumulated Amortization	(8,654)	(6,300)
Net	16,006	11,761
Capitalized internal-use software costs
Finite-Lived Intangible Assets [Line Items]
Gross	18,467	16,434
Accumulated Amortization	(7,441)	(5,172)
Net	11,026	11,262
Purchased developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	5,170	570
Accumulated Amortization	(570)	(570)
Net	4,600	0
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross	1,023	1,057
Accumulated Amortization	(643)	(558)
Net	$ 380	$ 499

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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