CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Revenue:
Total revenue	$ 421,720	$ 267,016	$ 166,028
Cost of revenue:
Total cost of revenue	125,356	73,568	42,859
Gross profit	296,364	193,448	123,169
Operating expenses:
Sales and marketing	223,893	148,296	109,073
Research and development	149,033	89,854	62,202
General and administrative	71,304	53,063	36,775
Total operating expenses	444,230	291,213	208,050
Loss from operations	(147,866)	(97,765)	(84,881)
Other income (expense):
Interest income	8,556	7,163	1,308
Interest expense	(20,983)	(10,290)	(8)
Other income (expense), net	(15,885)	(1,437)	895
Loss before provision for (benefit from) income taxes	(176,178)	(102,329)	(82,686)
Provision for (benefit from) income taxes	(656)	(3,318)	1,287
Net loss	$ (175,522)	$ (99,011)	$ (83,973)
Net loss per share, basic and diluted - (in dollars per share)	$ (3.14)	$ (1.90)	$ (3.54)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	55,939,032	52,034,596	23,718,391
Subscription
Revenue:
Total revenue	$ 399,826	$ 248,391	$ 151,853
Cost of revenue:
Total cost of revenue	101,691	56,255	30,766
Services
Revenue:
Total revenue	21,894	18,625	14,175
Cost of revenue:
Total cost of revenue	$ 23,665	$ 17,313	$ 12,093