Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Revenue:
Product	$ 90,793	$ 97,330	$ 68,652
Support and maintenance	35,111	27,775	17,360
Total revenue	125,904	125,105	86,012
Cost of revenue:
Product	38,959	34,738	25,138
Support and maintenance	13,907	9,437	7,110
Total cost of revenue	52,866	44,175	32,248
Gross profit:
Product	51,834	62,592	43,514
Support and maintenance	21,204	18,338	10,250
Total gross profit	73,038	80,930	53,764
Operating expenses:
Research and development	74,120	53,445	43,179
Sales and marketing	112,685	108,903	87,993
General and administrative	34,800	19,364	18,773
Restructuring charges	899
Total operating expenses	222,504	181,712	149,945
Loss from operations	(149,466)	(100,782)	(96,181)
Other expense, net:
Interest expense	(8,448)	(5,231)	(4,407)
Other income, net	733	677	254
Total other expense, net	(7,715)	(4,554)	(4,153)
Loss before provision for income taxes	(157,181)	(105,336)	(100,334)
Provision for income taxes	478	465	634
Net loss	(157,659)	(105,801)	(100,968)
Net loss attributable to common stockholders	$ (137,911)	$ (105,801)	$ (100,968)
Net loss per share attributable to common stockholders— basic and diluted	$ (6.98)	$ (30.73)	$ (32.15)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted	19,763,684	3,442,549	3,140,947
Series E and E-1 Converible Preferred Stock
Other expense, net:
Deemed dividend to Series E and E-1 Convertible Preferred Stock	$ (6,588)	$ 0	$ 0
Series E, E-1 and F Convertible Preferred Stock
Other expense, net:
Impact of adjustment to Series E, E-1 and F Convertible Preferred Stock	$ 26,336	$ 0	$ 0