Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Current:
State	$ 525	$ 389	$ 210
Foreign	3,580	1,806	2,198
Total	4,105	2,195	2,408
Deferred:
Foreign	(216)	(308)	(839)
Provision for income taxes	$ 3,889	$ 1,887	$ 1,569