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Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 69,440	$ 48,980	$ 192,139	$ 133,610
Cost of revenue	12,161	7,424	30,768	17,210
Gross profit	57,279	41,556	161,371	116,400
Operating expenses:
Sales and marketing	44,550	29,574	125,964	83,515
Research and development	20,553	15,869	55,529	42,040
General and administrative	13,272	7,275	32,868	19,982
Total operating expenses	78,375	52,718	214,361	145,537
Loss from operations	(21,096)	(11,162)	(52,990)	(29,137)
Other income (expense), net	709	(92)	240	(65)
Loss before income taxes	(20,387)	(11,254)	(52,750)	(29,202)
Provision for income taxes	482	59	1,157	151
Net loss and comprehensive loss	(20,869)	(11,313)	(53,907)	(29,353)
Accretion of Series A and B redeemable convertible preferred stock	(55)	(192)	(434)	(570)
Net loss attributable to common stockholders	$ (20,924)	$ (11,505)	$ (54,341)	$ (29,923)
Net loss per share attributable to common stockholders, basic and diluted (in usd per share)	$ (0.28)	$ (0.51)	$ (1.34)	$ (1.36)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)	74,261	22,679	40,688	22,004

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