Acquisitions - Additional Information (Details)		3 Months Ended	6 Months Ended
	May 04, 2015 USD ($)	Jul. 31, 2016 USD ($)	Jul. 31, 2016 USD ($) Company
Business Acquisition [Line Items]
Business acquisition, goodwill		$ 0	$ 0
Number of companies purchased and licensed | Company			2
Business acquisition, aggregate purchase price			$ 800,000
Developed Technology
Business Acquisition [Line Items]
Business acquisition, developed technology		$ 300,000	$ 300,000
Weighted average useful life			2 years
Verold, Inc.
Business Acquisition [Line Items]
Business acquisition, Purchase price paid in stock	$ 5,400,000
Business acquisition, goodwill	2,600,000
Verold, Inc. | Developed Technology
Business Acquisition [Line Items]
Business acquisition, developed technology	$ 2,800,000
Weighted average useful life	2 years
Other
Business Acquisition [Line Items]
Business acquisition, goodwill			$ 400,000