Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Income Statement [Abstract]
Revenue	$ 37,080	$ 27,125
Cost of revenue	9,688	8,835
Gross profit	27,392	18,290
Operating expenses:
Sales and marketing	28,462	16,843
Research and development	4,986	4,771
General and administrative	9,338	5,983
Total operating expenses	42,786	27,597
Loss from operations	(15,394)	(9,307)
Other expense, net	(680)	(35)
Loss from operations before income taxes	(16,074)	(9,342)
Provision for income taxes	(32)	(1)
Net loss	$ (16,106)	$ (9,343)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.40)	$ (0.30)
Weighted-average number of shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	40,466,620	30,978,083
Other comprehensive income:
Foreign currency translation adjustment	$ 192	$ 265
Total comprehensive loss	$ (15,914)	$ (9,078)