Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Revenue:
Product	$ 26,329	$ 20,768	$ 48,716	$ 37,445
Support and maintenance	8,537	6,788	16,505	12,987
Total revenue	34,866	27,556	65,221	50,432
Cost of revenue:
Product	11,470	7,160	20,379	13,096
Support and maintenance	3,682	2,568	6,721	4,640
Total cost of revenue	15,152	9,728	27,100	17,736
Gross Profit:
Product	14,859	13,608	28,337	24,349
Support and maintenance	4,855	4,220	9,784	8,347
Total gross profit	19,714	17,828	38,121	32,696
Operating expenses:
Research and development	23,080	12,989	38,003	26,648
Sales and marketing	32,607	24,466	60,049	49,462
General and administrative	13,171	4,911	18,503	10,586
Total operating expenses	68,858	42,366	116,555	86,696
Loss from operations	(49,144)	(24,538)	(78,434)	(54,000)
Other expense, net:
Interest expense	(2,798)	(1,376)	(4,072)	(2,813)
Other income, net	413	395	455	681
Total other expense, net	(2,385)	(981)	(3,617)	(2,132)
Loss before provision for income taxes	(51,529)	(25,519)	(82,051)	(56,132)
Provision for income taxes	138	153	296	351
Net loss	(51,667)	(25,672)	(82,347)	(56,483)
Deemed dividend to Series E and E-1 Convertible Preferred Stock	0	0	(6,588)	0
Impact of adjustment to Series E, E-1 and F Convertible Preferred Stock	26,336	0	26,336	0
Net loss attributable to common stockholders	$ (25,331)	$ (25,672)	$ (62,599)	$ (56,483)
Net loss per share attributable to common stockholders— basic and diluted	$ (2.05)	$ (7.53)	$ (7.78)	$ (16.63)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted	12,343,830	3,409,123	8,045,418	3,397,369