Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts, beginning balance	$ 944	$ 210	$ 160
Provision	1,394	918	50
Writeoffs	(338)	(184)	0
Allowance for doubtful accounts, ending balance	$ 2,000	$ 944	$ 210