CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Revenues:
Revenues	$ 101,784,000	$ 67,455,000	$ 278,267,000	$ 185,458,000
Cost of revenues:
Cost of revenues	37,294,000	21,664,000	99,113,000	58,429,000
Gross profit	64,490,000	45,791,000	179,154,000	127,029,000
Operating expenses:
Research and development	23,460,000	16,077,000	67,838,000	42,693,000
Sales and marketing	39,145,000	25,622,000	112,575,000	76,862,000
General and administrative	18,830,000	14,010,000	56,297,000	40,085,000
Total operating expenses	81,435,000	55,709,000	236,710,000	159,640,000
Loss from operations	(16,945,000)	(9,918,000)	(57,556,000)	(32,611,000)
Interest expense	(13,188,000)	(3,181,000)	(24,874,000)	(9,276,000)
Interest income and other, net	4,076,000	1,112,000	6,479,000	1,562,000
Loss before provision for (benefit from) income taxes	(26,057,000)	(11,987,000)	(75,951,000)	(40,325,000)
Provision for (benefit from) income taxes	260,000	(2,342,000)	(9,172,000)	(1,372,000)
Net loss	$ (26,317,000)	$ (9,645,000)	$ (66,779,000)	$ (38,953,000)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.42)	$ (0.17)	$ (1.08)	$ (0.68)
Weighted-average number of shares used in computing net loss per share attributable to common stockholders, basic and diluted	63,057	58,212	61,973	57,030
Subscription
Revenues:
Revenues	$ 90,175,000	$ 60,559,000	$ 246,614,000	$ 165,899,000
Cost of revenues:
Cost of revenues	23,752,000	13,990,000	63,217,000	36,937,000
Professional Services and Other
Revenues:
Revenues	11,609,000	6,896,000	31,653,000	19,559,000
Cost of revenues:
Cost of revenues	$ 13,542,000	$ 7,674,000	$ 35,896,000	$ 21,492,000