Goodwill and Intangible Assets, net - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Goodwill [Line Items]
Goodwill	$ 6,282,000		$ 6,282,000		$ 2,630,000
Goodwill impairments	0	$ 0	0	$ 0
Capitalized internal-use software	1,900,000	1,200,000	3,300,000	2,600,000
Amortization expense	700,000	400,000	1,400,000	700,000
Stormpath Inc.
Goodwill [Line Items]
Goodwill, acquired during period			3,700,000
Capitalized internal-use software costs
Goodwill [Line Items]
Stock-based compensation included in capitalized software costs	$ 400,000	$ 100,000	$ 600,000	$ 200,000