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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (208,913)	$ (125,497)	[1]	$ (109,849)	[1]
Net change in unrealized gains or losses on available-for-sale securities	1,220	179		(202)
Foreign currency translation adjustments	(9)	(889)		760
Other comprehensive income (loss)	1,211	(710)		558
Comprehensive loss	$ (207,702)	$ (126,207)		$ (109,291)
[1] Adjusted for adoption of ASC 842. See Note 2.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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