CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Revenue:
Total revenue	$ 99,368	$ 59,611	$ 188,756	$ 109,750
Cost of revenue:
Total cost of revenue	30,202	16,494	58,374	30,243
Gross profit	69,166	43,117	130,382	79,507
Operating expenses:
Sales and marketing	53,524	36,537	99,644	69,734
Research and development	37,140	21,430	68,008	40,075
General and administrative	16,174	12,254	30,979	23,481
Total operating expenses	106,838	70,221	198,631	133,290
Loss from operations	(37,672)	(27,104)	(68,249)	(53,783)
Other income (expense):
Interest income	2,231	1,518	4,534	2,477
Interest expense	(4,940)	(1,294)	(9,629)	(1,294)
Other expense, net	(296)	(656)	(711)	(1,024)
Loss before provision for income taxes	(40,677)	(27,536)	(74,055)	(53,624)
Provision (benefit) for income taxes	(3,341)	246	(3,479)	713
Net loss	$ (37,336)	$ (27,782)	$ (70,576)	$ (54,337)
Net loss per share, basic and diluted (in dollars per share)	$ (0.67)	$ (0.54)	$ (1.28)	$ (1.07)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	55,647,707	51,185,258	55,186,945	50,784,422
Subscription
Revenue:
Total revenue	$ 94,156	$ 55,086	$ 178,150	$ 101,155
Cost of revenue:
Total cost of revenue	24,373	12,116	46,968	22,186
Services
Revenue:
Total revenue	5,212	4,525	10,606	8,595
Cost of revenue:
Total cost of revenue	$ 5,829	$ 4,378	$ 11,406	$ 8,057