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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Income Statement And Statement Of Comprehensive Income [Abstract]
Revenue	$ 63,591	$ 49,786
Cost of revenue	10,418	6,963
Gross profit	53,173	42,823
Operating expenses:
Research and development	20,599	15,014
Sales and marketing	37,234	26,736
General and administrative	16,578	13,673
Total operating expenses	74,411	55,423
Loss from operations	(21,238)	(12,600)
Interest income	818	1,353
Interest expense	(1,317)	0
Other (expense) income, net	(616)	19
Loss before provision for income taxes	(22,353)	(11,228)
Provision for income taxes	(205)	(231)
Net loss	(22,558)	(11,459)
Other comprehensive (loss) income:
Unrealized (loss) gain on investments	(204)	642
Total comprehensive loss	$ (22,762)	$ (10,817)
Net loss per share, basic and diluted (in dollars per share)	$ (0.27)	$ (0.15)
Weighted average shares used in calculating net loss per share, basic and diluted (in shares)	82,915	77,770

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