Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Revenue
Total revenue	$ 125,119	$ 66,379	$ 329,304	$ 169,369
Cost of revenue
Total cost of revenue	37,355	22,274	98,211	60,243
Gross profit	87,764	44,105	231,093	109,126
Operating expenses
Sales and marketing	68,675	46,614	190,792	123,344
Research and development	35,992	25,968	91,497	62,546
General and administrative	21,615	13,614	63,737	28,868
Total operating expenses	126,282	86,196	346,026	214,758
Loss from operations	(38,518)	(42,091)	(114,933)	(105,632)
Interest expense	(132)	0	(297)	(428)
Other income (expense), net	3,579	303	3,523	(1,739)
Loss before provision for income taxes	(35,071)	(41,788)	(111,707)	(107,799)
Provision for income taxes	(434)	(535)	(1,664)	(1,018)
Net loss	$ (35,505)	$ (42,323)	$ (113,371)	$ (108,817)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in usd per share)	$ (0.17)	$ (0.93)	$ (0.89)	$ (2.45)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in shares)	204,096,000	45,287,000	128,009,000	44,344,000
Subscription
Revenue
Total revenue	$ 114,221	$ 57,651	$ 297,787	$ 146,570
Cost of revenue
Total cost of revenue	29,221	17,302	77,858	47,077
Professional services
Revenue
Total revenue	10,898	8,728	31,517	22,799
Cost of revenue
Total cost of revenue	$ 8,134	$ 4,972	$ 20,353	$ 13,166