Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	[2]	Oct. 31, 2018	Oct. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (29,517)	$ (33,066)	[1]	$ (94,686)	$ (86,804)	[1],[3]
Other comprehensive income (loss):
Net change in unrealized losses on available-for-sale securities	4	(58)		(44)	(70)	[2]
Foreign currency translation adjustments	(442)	(81)		(1,265)	168	[2]
Other comprehensive income (loss)	(438)	(139)		(1,309)	98	[2]
Comprehensive loss	$ (29,955)	$ (33,205)		$ (95,995)	$ (86,706)	[2]

[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.