Income Taxes - Summary of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Current income taxes:
Federal	$ 0	$ 0	$ 0
State	82	22	17
Foreign	976	308	80
Total current income taxes	1,058	330	97
Deferred income taxes:
Federal	13	5	4
State	1
Foreign	(224)
Total deferred income taxes	(210)	5	4
Total provision for income taxes	$ 848	$ 335	$ 101