Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	[2]
Statement of Comprehensive Income [Abstract]
Net loss	$ (25,962)	$ (27,706)	[1],[3]
Other comprehensive income (loss):
Net change in unrealized losses on available-for-sale securities	(125)	0
Foreign currency translation adjustments	(444)	68
Other comprehensive income (loss)	(569)	68
Comprehensive loss	$ (26,531)	$ (27,638)

[1] See Note 2 for a summary of adjustments.

[2] See Note 2 for a summary of adjustments.

[3] See Note 2 for a summary of adjustments.