Income Taxes - Schedule of Components of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Current:
Federal	$ 0	$ 0	$ 0
State	0	18	0
Foreign	183	426	295
Total current provision for income taxes	183	444	295
Deferred:
Federal	(32)	60	60
State	10	6	6
Foreign	(482)	(85)	(66)
Total deferred provision for (benefit from) income taxes	(504)	(19)	0
Total provision for (benefit from) income taxes	$ (321)	$ 425	$ 295