CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Income Statement [Abstract]
Revenue	$ 121,988	$ 60,070
Cost of revenue	24,104	11,660
Gross profit	97,884	48,410
Operating expenses:
Research and development	13,783	6,264
Sales and marketing	64,041	36,261
General and administrative	18,503	7,569
Total operating expenses	96,327	50,094
Income (loss) from operations	1,557	(1,684)
Interest income, net	658	436
Other income, net	315	5
Net income (loss) before provision for income taxes	2,530	(1,243)
Provision for income taxes	(316)	(97)
Net income (loss)	2,214	(1,340)
Undistributed earnings attributable to participating securities	(2,016)
Net income (loss) attributable to common stockholders	$ 198	$ (1,340)
Net income (loss) per share attributable to common stockholders:
Basic	$ 0.00	$ (0.02)
Diluted	$ 0.00	$ (0.02)
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders:
Basic	109,708,898	80,623,861
Diluted	136,428,379	80,623,861