Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Revenues:
Subscription services	$ 42,795,000	$ 30,799,000	$ 118,223,000	$ 83,954,000
Professional services and other	4,545,000	4,643,000	14,805,000	11,803,000
Total revenues	47,340,000	35,442,000	133,028,000	95,757,000
Cost of revenues:
Subscription services	9,554,000	6,346,000	26,575,000	18,425,000
Professional services and other	5,441,000	5,031,000	16,865,000	16,451,000
Total cost of revenues	14,995,000	11,377,000	43,440,000	34,876,000
Gross profit	32,345,000	24,065,000	89,588,000	60,881,000
Operating expenses:
Research and development	11,409,000	7,179,000	31,301,000	22,225,000
Sales and marketing	22,402,000	16,315,000	66,892,000	51,403,000
General and administrative	9,693,000	6,068,000	27,300,000	16,241,000
Total operating expenses	43,504,000	29,562,000	125,493,000	89,869,000
Loss from operations	(11,159,000)	(5,497,000)	(35,905,000)	(28,988,000)
Other income (expense), net	120,000	(986,000)	1,261,000	(1,509,000)
Loss before provision for income taxes	(11,039,000)	(6,483,000)	(34,644,000)	(30,497,000)
Provision for income taxes	263,000	211,000	438,000	502,000
Net loss and comprehensive loss	$ (11,302,000)	$ (6,694,000)	$ (35,082,000)	$ (30,999,000)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.21)	$ (0.36)	$ (0.67)	$ (3.10)
Weighted-average number of shares used in computing net loss per share attributable to common stockholders, basic and diluted	53,779	18,420	52,388	9,987