Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue	$ 86,649	$ 65,377	$ 168,859	$ 124,277
Cost of revenue	27,665	19,423	52,945	40,312
Gross profit	58,984	45,954	115,914	83,965
Operating expenses:
Sales and marketing	41,483	28,741	76,010	58,329
Research and development	20,251	14,937	38,330	29,109
General and administrative	24,664	16,799	47,226	32,710
Total operating expenses	86,398	60,477	161,566	120,148
Operating loss	(27,414)	(14,523)	(45,652)	(36,183)
Other expense, net:
Interest and investment income	100	235	233	1,808
Interest expense	(9,655)	(5,998)	(16,215)	(11,920)
Loss on extinguishment of convertible notes and capped call modification	(37)		(2,925)
Other expense, net	(602)	(438)	(651)	(515)
Total other expense, net	(10,194)	(6,201)	(19,558)	(10,627)
Loss before income taxes	(37,608)	(20,724)	(65,210)	(46,810)
Benefit from income taxes	3,787	1,504	9,600	2,205
Net loss	$ (33,821)	$ (19,220)	$ (55,610)	$ (44,605)
Net loss per share attributable to common stockholders:
Basic	$ (0.89)	$ (0.56)	$ (1.49)	$ (1.30)
Diluted	$ (0.89)	$ (0.56)	$ (1.49)	$ (1.30)
Weighted-average common shares outstanding:
Basic	38,014,107	34,402,704	37,204,958	34,238,887
Diluted	38,014,107	34,402,704	37,204,958	34,238,887