Quarterly Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results (unaudited)

	Three Months Ended
(in thousands, except per share amounts)	March 31, 2019			June 30, 2019			September 30, 2019			December 31, 2019
Revenue	$	80,301		$	85,384		$	91,852		$	97,049
Cost of revenue	13,226			13,918			15,245			18,429
Gross profit	67,075			71,466			76,607			78,620
Operating expenses:
Sales and marketing	52,689			56,015			56,699			62,632
Research and development	21,935			21,698			20,763			22,668
General and administrative	15,136			15,987			17,472			20,873
Total operating expenses	89,760			93,700			94,934			106,173
Loss from operations	(22,685		)	(22,234		)	(18,327		)	(27,553		)
Interest income, net	1,556			1,594			1,527			1,153
Other expense, net	(214		)	(122		)	(240		)	(104		)
Loss before income taxes	(21,343		)	(20,762		)	(17,040		)	(26,504		)
Provision for income taxes	97			866			600			11,801
Net loss	(21,440		)	(21,628		)	(17,640		)	(38,305		)
Accretion of Series A and B redeemable convertible preferred stock	—			—			—			—
Net loss attributable to common stockholders	$	(21,440	)	$	(21,628	)	$	(17,640	)	$	(38,305	)
Net loss per share attributable to common stockholders, basic and diluted	$	(0.23	)	$	(0.23	)	$	(0.18	)	$	(0.39	)

	Three Months Ended
(in thousands, except per share amounts)	March 31, 2018			June 30, 2018			September 30, 2018			December 31, 2018
Revenue	$	59,107		$	63,592		$	69,440		$	75,221
Cost of revenue	8,728			9,879			12,161			12,399
Gross profit	50,379			53,713			57,279			62,822
Operating expenses:
Sales and marketing	39,588			41,826			44,550			47,380
Research and development	17,185			17,791			20,553			21,169
General and administrative	9,055			10,541			13,272			13,864
Total operating expenses	65,828			70,158			78,375			82,413
Loss from operations	(15,449		)	(16,445		)	(21,096		)	(19,591		)
Interest (expense) income, net	(26		)	(23		)	894			1,510
Other income (expense), net	18			(438		)	(185		)	(326		)
Loss before income taxes	(15,457		)	(16,906		)	(20,387		)	(18,407		)
Provision for income taxes	431			244			482			1,207
Net loss	(15,888		)	(17,150		)	(20,869		)	(19,614		)
Accretion of Series A and B redeemable convertible preferred stock	(188		)	(191		)	(55		)	—
Net loss attributable to common stockholders	$	(16,076	)	$	(17,341	)	$	(20,924	)	$	(19,614	)
Net loss per share attributable to common stockholders, basic and diluted	$	(0.68	)	$	(0.73	)	$	(0.28	)	$	(0.21	)