CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 102,648	$ 80,301
Cost of revenue	18,701	13,226
Gross profit	83,947	67,075
Operating expenses:
Sales and marketing	59,855	52,689
Research and development	26,831	21,935
General and administrative	18,933	15,136
Total operating expenses	105,619	89,760
Loss from operations	(21,672)	(22,685)
Interest income, net	734	1,556
Other expense, net	(960)	(214)
Loss before income taxes	(21,898)	(21,343)
Provision for income taxes	1,079	97
Net loss	$ (22,977)	$ (21,440)
Net loss per share, basic and diluted (in usd per share)	$ (0.23)	$ (0.23)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	98,855	93,738