CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Revenue
Subscription	$ 239,177	$ 143,136	$ 76,443
Professional services and other	20,813	17,190	9,464
Total revenue	259,990	160,326	85,907
Cost of revenue
Subscription	52,481	34,211	20,684
Professional services and other	28,274	21,738	15,340
Total cost of revenue	80,755	55,949	36,024
Gross profit	179,235	104,377	49,883
Operating expenses
Research and development	70,821	38,659	28,761
Sales and marketing	172,973	118,742	77,915
General and administrative	51,803	30,099	19,195
Total operating expenses	295,597	187,500	125,871
Operating loss	(116,362)	(83,123)	(75,988)
Other income (expense), net	1,682	39	(19)
Loss before provision for (benefit from) income taxes	(114,680)	(83,084)	(76,007)
Provision for (benefit from) income taxes	(321)	425	295
Net loss	$ (114,359)	$ (83,509)	$ (76,302)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (1.38)	$ (4.39)	$ (4.28)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)	83,004	19,038	17,817