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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Income Statement [Abstract]
Revenue	$ 101,268	$ 74,302	$ 194,858	$ 137,600
Cost of revenue	20,238	15,271	39,796	27,370
Gross profit	81,030	59,031	155,062	110,230
Operating expenses:
Sales and marketing	61,621	38,756	121,032	75,301
Research and development	20,706	15,071	40,977	28,257
General and administrative	28,983	10,386	41,608	20,517
Total operating expenses	111,310	64,213	203,617	124,075
Loss from operations	(30,280)	(5,182)	(48,555)	(13,845)
Interest income	1,855	1,924	3,877	3,514
Other income (expense), net	(13)	250	(42)	62
Loss before income taxes	(28,438)	(3,008)	(44,720)	(10,269)
Provision for income taxes	716	547	1,510	874
Net loss	$ (29,154)	$ (3,555)	$ (46,230)	$ (11,143)
Net loss per share, basic and diluted (in dollars per share)	$ (0.23)	$ (0.03)	$ (0.36)	$ (0.09)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares)	128,408	122,741	127,978	121,664

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