Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenue:
Revenues	$ 120,958	$ 103,074	$ 349,174	$ 292,363
Total revenue	120,958	103,074	349,174	292,363
Cost of revenue:
Total cost of revenue	43,848	38,595	124,583	106,073
Gross profit	77,110	64,479	224,591	186,290
Operating expenses:
Research and development	28,034	26,321	88,203	68,630
Sales and marketing	58,333	47,067	162,290	127,152
General and administrative	20,288	32,758	70,923	72,672
Total operating expenses	106,655	106,146	321,416	268,454
Loss from operations	(29,545)	(41,667)	(96,825)	(82,164)
Interest income and other income (expense), net	(3,247)	2,001	(3,520)	2,574
Loss before provision for (benefits from) income taxes	(32,792)	(39,666)	(100,345)	(79,590)
Provision for (benefits from) income taxes	(633)	(46)	(459)	873
Net loss	$ (32,159)	$ (39,620)	$ (99,886)	$ (80,463)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.22)	$ (0.31)	$ (0.70)	$ (1.19)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	147,930	127,715	142,179	67,735
Subscription
Revenue:
Revenues	$ 96,936	$ 79,749	$ 278,759	$ 226,008
Cost of revenue:
Total cost of revenue	21,065	16,296	57,539	44,456
Professional services
Revenue:
Revenues	24,022	23,325	70,415	66,355
Cost of revenue:
Total cost of revenue	$ 22,783	$ 22,299	$ 67,044	$ 61,617