CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Revenue:
Subscription	$ 37,885	$ 23,805	$ 99,603	$ 64,018
Services	3,603	2,500	9,875	7,406
Total revenue	41,488	26,305	109,478	71,424
Cost of revenue:
Subscription	7,904	4,981	21,669	13,656
Services	3,167	2,238	8,789	7,866
Total cost of revenue	11,071	7,219	30,458	21,522
Gross profit	30,417	19,086	79,020	49,902
Operating expenses:
Sales and marketing	28,050	18,656	77,087	56,110
Research and development	16,588	13,300	45,414	38,540
General and administrative	9,829	6,385	26,533	19,916
Total operating expenses	54,467	38,341	149,034	114,566
Loss from operations	(24,050)	(19,255)	(70,014)	(64,664)
Other income (expense):
Interest income	227	83	556	221
Interest expense	0	(3)	(8)	(7)
Other income (expense), net	(57)	(257)	298	(158)
Loss before provision for income taxes	(23,880)	(19,432)	(69,168)	(64,608)
Provision for income taxes	336	103	817	253
Net loss	$ (24,216)	$ (19,535)	$ (69,985)	$ (64,861)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (1.39)	$ (1.57)	$ (4.74)	$ (5.41)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)	17,421,642	12,418,879	14,749,500	11,983,324