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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Income Statement [Abstract]
Revenue	$ 140,507	$ 117,222
Cost of revenue	39,068	32,723
Gross profit	101,439	84,499
Operating expenses:
Research and development	38,248	33,534
Sales and marketing	76,998	70,663
General and administrative	22,053	20,281
Total operating expenses	137,299	124,478
Loss from operations	(35,860)	(39,979)
Interest expense, net	(70)	(279)
Other (loss) income, net	(343)	16
Loss before provision (benefit) for income taxes	(36,273)	(40,242)
Provision (benefit) for income taxes	364	(156)
Net loss	$ (36,637)	$ (40,086)
Net loss per common share, basic and diluted	$ (0.26)	$ (0.30)
Weighted-average shares used to compute net loss per share, basic and diluted	138,524	131,469

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