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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Income Statement [Abstract]
Revenue	$ 122,941	$ 95,713	$ 240,163	$ 185,868
Cost of revenue	32,778	27,602	65,501	55,461
Gross profit	90,163	68,111	174,662	130,407
Operating expenses:
Research and development	34,042	28,265	67,576	55,172
Sales and marketing	73,271	60,186	143,934	119,658
General and administrative	21,846	17,579	42,127	32,088
Total operating expenses	129,159	106,030	253,637	206,918
Loss from operations	(38,996)	(37,919)	(78,975)	(76,511)
Interest expense, net	(236)	(189)	(515)	(365)
Other income, net	267	190	283	631
Loss before provision for income taxes	(38,965)	(37,918)	(79,207)	(76,245)
Provision for income taxes	320	184	164	432
Net loss	$ (39,285)	$ (38,102)	$ (79,371)	$ (76,677)
Net loss per common share, basic and diluted	$ (0.30)	$ (0.30)	$ (0.60)	$ (0.61)
Weighted-average shares used to compute net loss per share, basic and diluted	132,981	126,776	132,237	125,864

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