Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 65,377	$ 48,405	$ 124,277	$ 91,224
Cost of revenue	19,423	14,739	40,312	28,720
Gross profit	45,954	33,666	83,965	62,504
Operating expenses:
Sales and marketing	28,741	22,015	58,329	42,086
Research and development	14,937	12,802	29,109	24,287
General and administrative	16,799	10,464	32,710	21,022
Total operating expenses	60,477	45,281	120,148	87,395
Operating loss	(14,523)	(11,615)	(36,183)	(24,891)
Other expense, net:
Interest and investment income	235	1,332	1,808	2,509
Interest expense	(5,998)	(1,654)	(11,920)	(3,289)
Other income (expense), net	(438)	12	(515)	(94)
Total other expense, net	(6,201)	(310)	(10,627)	(874)
Loss before income taxes	(20,724)	(11,925)	(46,810)	(25,765)
Benefit from (provision for) income taxes	1,504	(138)	2,205	(432)
Net loss	$ (19,220)	$ (12,063)	$ (44,605)	$ (26,197)
Net loss per share attributable to common stockholders:
Basic	$ (0.56)	$ (0.37)	$ (1.30)	$ (0.80)
Diluted	$ (0.56)	$ (0.37)	$ (1.30)	$ (0.80)
Weighted-average common shares outstanding:
Basic	34,402,704	33,015,861	34,238,887	32,645,522
Diluted	34,402,704	33,015,861	34,238,887	32,645,522