Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Revenues:
Subscription services	$ 39,764,000	$ 27,783,000	$ 75,428,000	$ 53,155,000
Professional services and other	4,787,000	3,349,000	10,260,000	7,160,000
Total revenues	44,551,000	31,132,000	85,688,000	60,315,000
Cost of revenues:
Subscription services	9,025,000	6,029,000	17,021,000	12,079,000
Professional services and other	5,923,000	5,452,000	11,424,000	11,420,000
Total cost of revenues	14,948,000	11,481,000	28,445,000	23,499,000
Gross profit	29,603,000	19,651,000	57,243,000	36,816,000
Operating expenses:
Research and development	10,720,000	7,206,000	19,892,000	15,046,000
Sales and marketing	23,812,000	19,252,000	44,490,000	35,088,000
General and administrative	9,430,000	4,620,000	17,607,000	10,173,000
Total operating expenses	43,962,000	31,078,000	81,989,000	60,307,000
Loss from operations	(14,359,000)	(11,427,000)	(24,746,000)	(23,491,000)
Other income (expense), net	707,000	(846,000)	1,141,000	(523,000)
Loss before provision for income taxes	(13,652,000)	(12,273,000)	(23,605,000)	(24,014,000)
Provision for income taxes	90,000	165,000	175,000	291,000
Net loss and comprehensive loss	$ (13,742,000)	$ (12,438,000)	$ (23,780,000)	$ (24,305,000)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.26)	$ (2.13)	$ (0.46)	$ (4.25)
Weighted-average number of shares used in computing net loss per share attributable to common stockholders, basic and diluted	52,749	5,826	51,681	5,721